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Extraskeletal Myxoid Chondrosarcoma- Rare ‘Non-chondroid’ soft tissue Sarcoma!!!

January 10, 2016

Volume 2 | Issue 1 | Jan-Apr 2016 | Page 36-38 |Shital Biradar, Sujit Joshi, Yogesh Panchwagh, Vikram Ghanekar, Pradeep Kothadiya. Authers: Shital Biradar[1], Sujit Joshi[1], Yogesh Panchwagh[2], Vikram Ghanekar[3], Pradeep Kothadiya[4]. [1]Dept. of Pathology, Deenanath Mangeshkar hospital, Pune. [2]Histopathologist, Deenanath Mangeshkar hospital, Pune. [3]Orthopedic Onco-surgeon, Deenanath Mangeshkar hospital, Pune. [4]Surgical oncologist, S.G.M. Hospital; Chiplun. […]

Fibrous Dysplasia – an Update

January 10, 2016

Volume 2 | Issue 1 | Jan-Apr 2016 | Page 39-43 | Ashish Gulia, Pankaj Kumar Panda. Author: Ashish Gulia [1] , Pankaj Kumar Panda [2] [1]Orthopaedic Oncologist, Tata Memorial Hospital, Mumbai. [2]Post-graduate Student, Clinical Research, Tata Memorial Hospital, Mumbai Address of Correspondence Dr Ashish Gulia Associate Professor, Orthopedic Oncology, Dept. of Surgical Oncology, Tata […]

Extraskeletal Myxoid Chondrosarcoma- Rare ‘Non-chondroid’ soft tissue Sarcoma!!!

January 10, 2016

Fibrous Dysplasia – an Update

January 10, 2016

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Extraskeletal Myxoid Chondrosarcoma- Rare ‘Non-chondroid’ soft tissue Sarcoma!!!

January 10, 2016

Volume 2 | Issue 1 | Jan-Apr 2016 | Page 36-38 |Shital Biradar, Sujit Joshi, Yogesh Panchwagh, Vikram Ghanekar, Pradeep Kothadiya.

Authers: Shital Biradar[1], Sujit Joshi[1], Yogesh Panchwagh[2], Vikram Ghanekar[3], Pradeep Kothadiya[4].

[1]Dept. of Pathology, Deenanath Mangeshkar hospital, Pune.
[2]Histopathologist, Deenanath Mangeshkar hospital, Pune.
[3]Orthopedic Onco-surgeon, Deenanath Mangeshkar hospital, Pune.
[4]Surgical oncologist, S.G.M. Hospital; Chiplun.
[5]Orthopedic Surgeon, Kothadiya Hospital; Solapur.

Address of Correspondence
Dr. Sujit Joshi
Flat No: 2, Lunawat Reality, Opp. Vanaz Company, Paud road, Kothrud, Pune-411038.
Email ID: sujitjoshi30@gmail.com

Abstract

Extraskeletal myxoid chondrosarcoma (ESMC) is an uncommon but distinct entity with clearly different clinicopathological, immunohistochemical and cytogenetic features from those of conventional skeletal chondrosarcoma. Because of its better prognosis as compared to conventional skeletal chondrosarcoma, an accurate diagnosis is essential. We present 2 cases of this tumor with different clinical presentations.
1. 40 year old house wife presenting with a 9x8cm size mass around lower end of femur. On imaging, it was a soft tissue mass abutting the femoral surface with minimal bone invasion.
2. 50 year old lady presenting with a huge fungating soft tissue mass over left lower leg and foot associated with similar cutaneous nodules over right arm and left thigh. The left leg mass had caused destruction of entire lower end of fibula.
Histopatholgical evaluation of both cases showed features of Extraskeletal Myxoid Chondrosarcoma (ESMC). Characteristic histopathological features include a malignant soft tissue neoplasm with lobulated growth pattern, abundant myxoid matrix and fairly bland looking tumor cells. There is no convincing evidence of cartilagenous differentiation or chondroid matrix production. Immunohistochemistry has a limited role.
ESMC is a tumor with long survival but a prolonged follow up is necessary in view of high local recurrence, high metastatic rates and high disease related mortality. The diagnosis of this tumor largely depends upon knowledge of this entity and its characteristic histopathological features.
Key words: Extra-skeletal myxoid chondrosarcoma; ESMC.

Introduction

Extraskeletal myxoid chondrosaroma (ESMC) is a rare malignant soft tissue sarcoma described as a distinct clinico-pathologic entity by Enzinger and Shiraki in 1972 [1]. WHO categorized this tumor as a tumor of uncertain differentiation since there is paucity of convincing evidence of cartilagenous differentiation. It is a rare tumor, accounting for less than 3% of soft tissue sarcomas [2,3]. The tumor usually develops in deep parts of the proximal extremities and in middle-aged adults [4]. More than two-thirds of the tumors occur in the proximal extremities and limb girdles, especially the thigh and popliteal fossa. Here, we are presenting the detailed clinico-pathological findings of two such cases, which were diagnosed in our institute.

Case Report

Case 1: 40 year old housewife presented with lower limb swelling and pain just above the knee joint which started since 5 months (Fig 1). Plain radiographs reveal a soft tissue mass abutting the femoral surface with minimum bony involvement in supracondylar region of femur suggestive of a soft tissue neoplasm (Fig. 2). MRI revealed a large extra-osseous soft tissue lesion with minimal intra-osseous extension suggestive of a juxtacortical neoplasm or soft tissue sarcoma (Fig. 3). Open biopsy was done elsewhere and reports were reviewed at authors institute. It showed microscopic features of ESMC. Considering the interosseous involvement and safe oncological margins, a wide resection was planned. The patient underwent limb salvage surgery in form of wide local excision of distal femur along with the mass and reconstruction with a megaprosthesis. Pathological Findings: On gross examination of the wide local excision specimen of distal femur, there was an extra-osseous mass at the lower end of femur on the postero-lateral aspect measuring 9×8 cm in size. It was a soft to firm, ovoid, lobulated mass which on cut section, was gelatinous, mucoid and gray-white. There was no evidence of necrosis or haemorrhage noted (Fig 4). Microscopically, it showed a characteristic multi-nodular pattern. Tumor cells were small round with hyperchromatic nuclei and a narrow rim of cytoplasm (Fig 5a). Cells were arranged in cords and strands separated by abundant myxoid material (Fig 5b,c). No cartilaginous matrix production was seen in the stroma. On Immuno-histochemestry (IHC) the cells showed strong positivity for Vimentin and focal positivity for S-100 protein. These cells were negative for Cytokeratin, EMA, Synaptophysin and Chromogranin. Based on morphological and IHC findings, a diagnosis of Extra-skeletal myxoid chondrosarcoma (ESMC) was reached.

Case 2: 50 year old lady presented with a huge fungating soft tissue mass over left foot associated with similar cutaneous nodules over right arm and left thigh. The foot lesion was progressively increasing over a year but not associated with pain. (Figure 6a, 6b)
X-ray of left foot and lower limb revealed a large soft tissue mass destroying the metatarsals , devoid of any matrix and periosteal reaction (Fig. 7a). Similar lesion was seen destroying the ipsilateral distal fibula (Fig. 7b). Biopsies from the foot mass and the arm nodule revealed histopathological and IHC findings consistent with Extraskeletal Myxoid Chondrosarcoma (ESMC). This patient defaulted for further treatment and follow up.

Discussion:
Extraskeletal myxoid chondrosarcoma (ESMC) is a rare, morphologically distinct soft tissue sarcoma with characteristic nodular architecture & abundant myxoid matrix. In 1972, Enzinger and Shiraki were the first ones who coined ESMC as a distinct entity [1]. In spite of it’s name, Extraskeletal myxoid chondrosarcoma (ESMC) is considered as a “Tumor of uncertain differentiation” because there is no definite evidence of cartilage matrix production in the tumor. Histogenesis of ESMC is still subject of controversy. Incidence of this tumor is only 2.3% of all soft tissue sarcomas as reported by Tsuneyosi et al [2]. Mainly the adult age group (35 years and above) is affected by this tumor, with equal sex predilection [3]. Most common sites are deep soft tissues of the proximal extremities and limb girdles, especially the musculature [4]. However, few uncommon sites are also been described like mediastinum, retroperitoneum, abdomen and the digits [5-7]. In both of our cases, imaging showed that it was a lobulated soft tissue mass without bony periosteal reaction or any radiologically evident matrix production. Histopathologically, both cases showed presence of uniform eosinophilic cells arranged in cords & deposited in an abundant myxoid stroma. There was no evidence of cartilage/osteoid matrix deposition.
The most important clue to the diagnosis of this rare entity is the typical arrangement of cells in cords and columns with a very prominent myxoid background [8]. ESMC appears to exhibit a high tendency of local recurrence & distant metastases, predominantly to the lungs, sometimes years after the initial diagnosis [9]. ESMC should be considered an intermediate grade tumor rather than a low-grade malignant neoplasm as the estimated 5, 10 and 15-year survival rates described by Meis-Kindblom et al were 90%, 70% & 60% respectively [4]. Wide local excision of the tumor is the treatment of choice. If a wide margin can not be obtained, a high rate of local recurrence is observed with poor response to chemotherapy & radiotherapy. Therefore, surgery with appropriate adequate margins continues to be the treatment of choice, for primary as well as recurrent or metastatic tumors.
On follow up part, our first patient is disease free at 6 years from date of surgery with excellent function in the operated limb (MSTS score 97%). The second patient defaulted for further treatment and was lost to follow up. Some adverse pathological prognostic factors reported in literature include Tumor size ≥ 10 cm, high cellularity, anaplasia or rhabdoid features, mitotic activity more than two per 10 high-power fields, and Ki-67 proliferative index of ≥ 10%. These indicate more aggressive behavior, requiring a closer follow-up of the patient [10]. In summary, ESMC is an uncommon but distinct soft tissue sarcoma, clearly different from conventional skeletal chondrosarcoma. Knowledge of this entity and accurate diagnosis is essential because of the difference in its behaviour and prognosis.

References

1. Enzinger FM, Shiraki M. Extraskeletal myxoid chondrosarcoma. An analysis of 34 cases.Hum Pathol 3: 421-35,1972.
2. Tsuneyoshi M, Enjoji M, Iwasaki H and Shirahama N: Extraskeletal myxoid chondrosarcoma: a clinicopathologic and electron microscopic study. Acta Pathol Jpn 31: 201-208, 1981.
3. Antonescu CR, Argani P, Erlandson RA, et al: Skeketal and extraskeletal myxoid chondrosarcoma: a comparative clinicopathologic, ultrastructural, and molecular study. Cancer 83:1504-1521, 1998.
4. Meis-Kindblom JM, Bergh P, Gunterberg B, et al: Extraskeletal myxoid chondrosarcoma: a reappraisal of its morphologic spectrum and prognostic factors based on 117 cases. Am J Surg Pathol 23: 636-650, 1999.
5. Oliveira AM, Sebo TJ, McGrory JE, et al: Extraskeletal myxoid chondrosarcoma; A clinocopathologic, immunohistochemical, and ploidy analysis of 23 cases. Mod Pathol 13: 900-908, 2000.
6. Patel SR, Burgess MA, Papadopculos NE, Linke KA and Benjamin RS: Extraskeletal myxoid chondrosarcoma: long-term experience with chemotherapy. Am J Clin Oncol 18: 161-163,
1995.
7. Okamoto S, Hara K, Sumita S, et al: Extraskeletal myxoid chondrosarcoma arising in the finger. Skeletal Radiol 31: 296-300, 2002.
8. Jakowski JD, Wakely PE Jr. Cytopathology of extra-skeletal myxoid chondrosarcoma: Report of 8 cases. Cancer 2001; 111:298-305
9. Weiss SW and Goldblum JR: Extraskeletal myxoid chondrosarcoma. In: Soft Tissue Tumors 4th Edition. Mosby, St. Louis,pp1368-1379, 2001.
10. Oliveria Am, Sebo TJ, McGrory JE, Gaffey TA, Rock MG, Nascimento AG. Extraskeletal myxoid chondrosarcoma: A clinicaqopthologic, immunohistochemical & ploidy analysis of 23 cases. Mod Pathol 2000; 13:900-8.

How to Cite this article:Biradar S, Joshi S, Panchwagh Y, Ghanekar V, Kothadiya P. Extraskeletal Myxoid Chondrosarcoma- Rare ‘Non-chondroid’ soft tissue Sarcoma!!!. Journal of Bone and Soft Tissue Tumors Jan-Apr 2016;2(1):36-38 .

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Fibrous Dysplasia – an Update

January 10, 2016

Volume 2 | Issue 1 | Jan-Apr 2016 | Page 39-43 | Ashish Gulia, Pankaj Kumar Panda.

Author: Ashish Gulia [1] , Pankaj Kumar Panda [2]

[1]Orthopaedic Oncologist, Tata Memorial Hospital, Mumbai.
[2]Post-graduate Student, Clinical Research, Tata Memorial Hospital, Mumbai

Address of Correspondence
Dr Ashish Gulia
Associate Professor, Orthopedic Oncology, Dept. of Surgical Oncology, Tata Memorial Hospital,
Mumbai – 400012, India.
Email: aashishgulia@gmail.com

website: animaljam2.net

Abstract

Background: Fibrous dysplasia (FD) belongs to a group of non-hereditary benign pathologies in which immature bone and fibrous stroma replaces normal medullary bone. The gene for FD is located on band 20q13, an area that codes for the α subunit on G-protein receptors. It is most commonly diagnosed in the first three decades of life. Amongst the 4 major clinical forms of FD (namely monostotic, polyostotic, McCune-Albright syndrome, Mazabraud’s syndrome) the monostotic form predominates (70-80%) in comparison to the polyostotic form. “Ground Glass appearance is a characteristic appearance on plain radiograph. Histopathologically fibrous component is relatively avascular, composed of cytologically bland spindle cells with few trabecular structures. The management ranges from watchful observation to surgical intervention.
Key-words: Fibrous dysplasia, polyostotic, monostotic, bone grafting, bisphosphonates.

Introduction
Fibrous dysplasias (FD) are a group of non-hereditary benign pathologies in which immature bone and fibrous stroma replace normal medullary bone as a result of abnormal differentiation of osteoblasts characterized by solitary (monostotic) or multi focal medullary (polyostotic) fibro osseous lesions. They contain mutated fibroblast cells and osteoblasts of varying functionality, which produce abnormally immature woven bone [1]. They are accounted for 2.5% of all the bone tumors and 5–7% of all benign bone tumors [2]. The detailed description as a benign developmental disorder of the bone was given by Lichtenstein and Jaffe in 1942 and thus it is referred as Lichtenstein-Jaffe disease [3]. The dormancy of FD increases from childhood to adulthood, however there is a life time risk of malignant transformation that of around 1–4% [4].

Etiopathogenesis
Cessation of bone maturation process at the stage of woven bone formation leading to inability to produce mature lamellar bone accounts for development of fibrous dysplasia. There have been many theories which have tried to explain the genesis of fibrous dysplasia. Excessive production of interleukin-6 production at local site has been related to increased resorption of bone by increasing the numbers of osteoclasts in these lesions. Genetic theory postulates that somatic mutation early in embryonic life causes a gene mosaicism. The earlier the mutation occurs, the more widespread the effects will be. The gene is located on band 20q13, an area that codes for the α subunit on G-protein receptors Mutations in the gene (GNAS I) result in a cascade which may lead to alteration in cellular differentiation and osteoblastic proliferation [5, 6]. According to hormonal theory, osteoblasts in ﬁbrous dysplastic lesions have an elevated number of hormone receptors and thus have altered responses of bone formation. Hormonal alteration occurring during life, like in pregnancy usually sees exuberated growth of these lesions, thus explaining its hormonal genesis. Another theory explains that cAMP also activates Fos, which inhibits osteoblastic specific genes as well as stimulating cytokines that promote bone resorption by osteoclasts. Hypophosphatemia/phosphaturia, sometimes found in FD, is caused by excess secretion of a phosphatonin fibroblast growth factor [7].

Clinical Presentation and evaluation

FD is most commonly observed between 3 to 15 years age group, and majority of the cases are diagnosed in the first three decades of life. Polyostotic lesions usually present earlier as they are associated with a more severe form of the disease. Males and females are equally affected [9, 10]. Majority of patients with the polyostotic form of FD are symptomatic before the age of 10 years [7]. The monostotic form predominates (70-80%) in comparison to the polyostotic form [8]. Site affection may vary with the form of the disease. According to the sites of involvement for the polyostotic form femur, tibia are most commonly involved followed by skull and facial bones, pelvis, rib, humerus, radius and ulna, lumbar spine, clavicle, and cervical spine. The lesions may be unilateral or, less commonly, bilateral. Symptoms are related to the severity of the disease. Monostotic lesions may be asymptomatic and found incidentally. Polyostotic lesions present early with more symptoms in 60% of the patients. Pain along with swelling and deformity are the most common presenting complaints which is due to structural weakness and micro fractures in the affected bone. Deformity occurs due to abnormal bone growth or micro fractures and subsequent remodeling. Deformities of the lower limb especially the proximal femur can cause an antalgic gait and have a high risk of developing leg length discrepancies and pathological fractures. Common deformities are varus deformity of the proximal femur also known as the “shepherd’s crook deformity”, tibial bowing, bossing of the skull, prominent jaw, rib and chest wall masses. Symptoms may get exacerbated during pregnancy [7, 11].

Four types of fibrous dysplasias have been reported so far based on clinical conditions [11].
Monostotic FD: This represents around 70-80% of all FDs. This is the only form where craniofacial bones are affected. It occurs mostly in the age group of 20-30 years. Non-osteogenetic fibroma, aneurysmal bone cyst, giant cell tumor of bone, adamantinoma, eosionophilic granuloma and plasma cell myeloma should be considered in the differential diagnosis of monostotic FD [8, 12]
Polysototic FD: It accounts for 20-25% of all FDs. More than one of the bones in the skeletal and craniofacial system is affected and it occurs in the first decade of life. Hyperparathyroidism, polyostotic Paget’s disease, neurofibromatosis and cherubism should be considered in the differential diagnosis of polyostotic FD [8, 12].
McCune-Albright syndrome: It is a triad of polyostotic ﬁbrous dysplasia, cutaneous café-au-lait spots and endocrine dysfunction. The syndrome was named after 2 physicians, Donovan McCune and Fuller Albright, who separately described the triad in 1937. It accounts for about 3% of all fibrous dyplasias and 35% to 50% of cases of polyostotic ﬁbrous dysplasias. Females are affected more than males. Patient suffering from this syndrome will have hyperpigmented skin lesions with irregular “coast of Maine” borders with ipsilateral bony ground glass lesions. Endocrinopathies include hyperprolactinemia, gonadotropin-independent precocious puberty, growth hormone excess, hyperthyroidism, FGF23-mediated renal phosphate wasting and Cushing’s syndrome [13].
Mazabraud’s syndrome: Patients suffering from this syndrome present with soft tissue myxomas with polyostotic ﬁbrous dysplasia. The myxomas generally develop later than FD adjacent to the affected bones. These are more commonly seen in extremities alongside long bones. [14].
Cherubism: It is an autosomal dominant disorder which is characterized by symmetric involvement of both the mandible and maxilla and manifests during the second decade of life. These lesions generally become static at skeletal maturity [15].

Radiological evaluation
Plain radiograph: Plain radiograph is the gold standard to evaluate a fibrous dysplasia lesion. It typically shows a well defined medullary lesion, which is usually mildly expansile and is centered in either metaphysis or diaphysis with or without endosteal scalloping with a varying degree of translucency. The medullary canal is replaced with ﬁbrous tissue formed of delicate woven bone spicules that give the tissue its “ground glass” appearance. There may be endosteal scalloping of the inner cortex, but the periosteal surface is smooth and nonreactive. [16]. The deformities (shephard’s crook curvature of femur and coxa vara deformity of the knee) may vary in severity (Figure 1: Radiograph (AP view) of the pelvis showing polyostotic fibrous dysplasia with classic “Shephard’s Crook Deformity”). Radiological characteristics of the lesions differ with respect to the bone and fibrous matrix ratio and are usually seen as three different patterns. Firstly the pagetoid pattern where the rate of the bone–fibrous matrix is equal, secondly sclerotic pattern in which the bone structure is in the foreground and thirdly the radiolucent pattern where the fibrous matrix is in the foreground [17].

Computed tomography: A CT scan demonstrates the extent of the lesion. The appearance may vary according to the amount of calcification and ossification in the lesion. CT Imaging may be more useful in evaluation of craniofacial FDs. [11].
Bone scintigraphy: It is helpful in detecting the extent of disease and distribution particularly of active lesions in adolescent period [18]. It may also be helpful in detecting stress fractures.
Magnetic resonance Imaging (MRI): MRI is helpful in assessing the exact location, extent, shape and content of FD lesion. It characteristically demonstrates a low-intensity signal on T1-weighted images due to its fibrous content. T2-weighted images demonstrate moderately intense signals which are darker than signal of malignant tissue, fat or fluid. MRI is also helpful in detecting malignant transformation of a FD lesion, which may be evident with features like cortical bone erosion, destruction and soft tissue masses [19].

Histopathological evaluation
The lesions show an expanded bone with well-circumscribed, tan grey mass that is dense and variably fibrous with a gritty consistency due to the presence of bone trabeculae. It may show cystic areas in older lesions with some yellow-tinged fluid. A glassier, blue-tinged appearance may be found in cases with chondroid metaplasia [7].

Microscopic appearance: Microscopic evaluation shows varying proportions of fibrous and osseous tissue. The fibrous component is avascular and composed of cytologically bland spindle cells demonstrating low mitotic rate without atypia. Trabecular structures show an abnormal arrangement resembling Chinese letters which is composed of woven bone. Secondary myxoid and aneurysmal bone cyst like changes can be seen. Occasional nodules of benign hyaline cartilage may also be seen. Osteoblastic cells create fibrous tissue instead of a normal bone tissue in the bone medulla [20, 21]

Differential Diagnosis
The differential diagnosis of FD varies based on location, extent of lesion and age of the patient. These mainly include simple bone cyst, enchondroma, eosinophilic granuloma, brown tumor of hyperparathyroidism, giant cell tumor, neurofibromatosis, osteoblastoma, hemangioma of bone. osteofibrous dysplasia, fracture callus, non-ossifying fibroma, and low-grade Osteosarcoma can be included in the differential diagnosis based on histopathological findings. Low-grade chondrosarcoma may be part of the differential diagnosis if there is a prominent chondroid component. Osteofibrous dysplasia and fracture callus can be differentiated by the history and location of the lesion, and they typically have prominent osteoblastic rimming around the bone trabeculae[7].

Treatment
Management of FD should focus on reducing pain, optimizing function, and managing endocrinopathies, if they exist. The choice of treatment is usually guided by, site & extent of lesion, growth of lesion, related symptoms and age of the patient; it can vary from a watchful observation to surgical intervention. Monostotic asymptomatic lesions can be observed and followed up with serial radiographs to look for progression of the lesion. Large symptomatic lesions especially in the lower limb require active management, which may include non surgical (medical) or surgical management. Surgical interventions should be dealt with caution as complete resections are not possible mostly and incomplete resections have high chances of recurrence [22]. Medical management with bisphosphonates is helpful in most sympotomatic monostotic lesions without fractures or deformity. Third generation bisphosphonates (zolendronic acid) have shown remarkable success rate in relieving bone pain and healing of lesions. This is radiologically evident by improved cortical thickness, ossiﬁcation of the lesion and improved function. These have also shown to reduce the rate of complications like pathological fracture. Intravenous 4 mg zolendronic acid along with vitamin D and oral calcium supplements is the choice of treatment [23]. Denosumab also appears to be effective in reducing bone turnover in adult patients with active FD. However, caution should be exercised, and patients should be monitored carefully as significant fluctuations in biochemical and hormonal indices can occur [24] and hence Denosumab is not recommended for regular use. Surgical intervention is indicated in cases of failure of nonsurgical therapy, large painful lesions, progressive deformity, non-union or malignant transformation. Curettage and bone grafting is the main cornerstone of surgical management. Cortical strut allograft should be used whenever possible as cancellous grafts may get resorbed due to natural disease process. Appropriate internal fixation should be used judiciously. Deformities especially in lower limb require surgical correction. Valgus osteotomy and medial displacement osteotomy are used to correct these deformities. (Figure 2: (a) Radiograph showing Fibrous dysplasia (mixed lytic sclerotic expansile lesion) in the proximal metadiaphyseal region of the right tibia. (b) Post treatment radiograph showing curettage and bone grafting and interfixation) [24].
Prognosis: Generally the prognosis of FD patient is excellent in the absence of malignant transformation. Monostotic FDs have better prognosis than polyostotic or syndromal FDs. Medical management is also more successful in monostotic lesions. Femoral lesions, younger age group patients, polyostotic disease and surgical interventions without internal fixation are the negative prognostic factors for surgical management. Malignant transformation is rare (Figure 3: Radiograph of right femur showing malignant transformation in a pre existing fibrous dysplasia lesion) [25].

Complications: Main complications related to FD are uncontrolled pain, deformities, pathological fractures, limb length discrepancy and malignant transformation. Malignant transformation commonly occurs to osteosarcoma or ﬁbrosarcoma. It generally presents with increase intensity of pain with associated progressively increasing mass with or without pathological fracture. It is more common in polyostotic disease with Endocrinopathies. The rates of malignant transformation have been estimated to be about 0.5% with monostotic FD and about 4% with McCune-Albright syndrome [26]. Prognosis is usually poor. These are managed with multimodality treatment including surgery and chemotherapy [27]

Conclusion

Fibrous Dysplasia even though has good prognosis, there is a wide range of severity in patients all over. While some are minimally affected, some present with numerous fractures and significant deformities. With the advent of advanced imaging modalities and molecular pathology, a better understanding of the pathogenesis of FD has been possible. Non-surgical treatment regimens are increasingly being followed owing to their better compliance and overall improvement in patients’ quality of life by minimizing pain.

References

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4. StantonRP. Surgery for fibrous dysplasia. J Bone Miner Res 2006; 21(Suppl 2): P105–P109.
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9. Sharma RS, Mahapatra AK, Pawar SJ, et al. Symptomatic cranial fibrous dysplasia: clinico-radiological analysis in a series of 8 operative cases with follow-up results. J Clin Neurosci 2002; 9(4):381–90.
10. Rajendran R, Sivapathasundharam R. Shafer’s textbook of oral pathology 5th edition. New Delhi, India: Elsevier, a division of Reed Elsevier India Private Limited; 2006. p. 971–9.
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12. Resnick D. Diagnosis of bone and joint disorders. 4th ed. Philadelphia, PA: Saunders; 2002. 4285–4840.
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14. Iwasko N, Steinbach LS, Disler D, et al. Imaging findings in Mazabraud’s syndrome: seven new cases. Skeletal Radiol 2002; 31:81–7.
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How to Cite this article: Gulia A, Panda PK. Fibrous Dysplasia – an Update. Journal of Bone and Soft Tissue Tumors Jan-Apr 2016;2(1): 39-43.

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Extraskeletal Myxoid Chondrosarcoma- Rare ‘Non-chondroid’ soft tissue Sarcoma!!!

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Fibrous Dysplasia – an Update

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Journal of Bone and Soft Tissue Tumors (JBST) Editorial Office

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Authers: Shital Biradar[1], Sujit Joshi[1], Yogesh Panchwagh[2], Vikram Ghanekar[3], Pradeep Kothadiya[4].

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Author: Ashish Gulia [1] , Pankaj Kumar Panda [2]

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Journal of Bone and Soft Tissue Tumors (JBST) Editorial Office

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Journal of Bone and Soft Tissue Tumors (JBST) License