iarjmcrIARJMCRIARJMCR2709-3220https://doi.org/10.47310/iarjmcr.2022.v03i02.001Monophasic Synovial Sarcoma in A 16 year Old: A Rare OccurrenceTenzinLhanzeDingyonLalitaNegiManuTiwariMonophasic synovial sarcoma is a rare tumor with only a few cases reported in the young age group. We report a case of monophasic synovial sarcoma in a 16 years old male which initially presented with mass in the anterior compartment of the left thigh. On MRI, a large lobulated heterogeneously enhancing altered SI mass below the vastus medialis not involving the underlying bone. Excision biopsy was done by the department of Surgery and sent to department of Pathology, IGMC Shimla. The tumour cells were immunoreactive for Vimentin, CD99, TLE1, Bcl2. A diagnosis of Monophasic Epithelial Synovial Sarcoma was made.