Skeletal Muscle Metastases Arising from Renal Cell Carcinoma in a 58-Year-Old Male: A Case Report
Original Article | Volume 6 | Issue 3 | JBST September – December 2020 | Page 20-25 | Sybill Sue M. Moser, Edwin Joseph R. Guerzon, John Christopher R. Ragasa DOI: 10.13107/jbst.2020.v06i03.035
Author: Sybill Sue M. Moser, Edwin Joseph R. Guerzon, John Christopher R. Ragasa
Department of Orthopedics, Institute of Orthopedics and Sports Medicine, St. Luke’s Medical Center – Quezon City, Manila, Philippines.
Address of Correspondence:
Dr. Sybill Sue M. Moser
2632 Molave St. United Hills Village,
Parañaque City, Metro Manila, Philippines.
Introduction: Renal cell carcinoma (RCC) is the most common malignant kidney tumor, commonly metastasizing to the lung, lymph nodes, bones, and brain. Here, we present a rare case of renal cell skeletal muscle metastases (SMMs), accounting for only <1% of all RCC metastases.
Methods: This is a descriptive report on the clinical course, diagnostic investigations, and surgical treatment of a case of SMM in a patient previously diagnosed with RCC.
Results: This is a 58-year-old male who previously underwent radical nephrectomy for RCC, presenting with a 5-month history of a rapidly enlarging left gluteal mass. The mass was confirmed to be renal clear cell metastasis through percutaneous biopsy. On magnetic resonance imaging, two heterogeneously enhancing lesions in the left gluteal muscle and right paralumbar muscles at the level of L4 and L5 were noted. Positron emitted tomography scan confirmed no other metastases. He underwent wide excision of the right paraspinal mass and buttockectomy for the left gluteal mass.
Conclusion: SMM in RCC is rare, thus tissue diagnosis and imaging is deemed necessary to rule out any other primary sarcoma. In these cases, patients may benefit from metastasectomy. Regular follow-up and surveillance are recommended for these patients to rule out recurrence.
Keywords: Renal cell carcinoma, metastases, extraskeletal, buttockectomy.
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