A Case of Extraskeletal Ewing's Sarcoma - A Rare Tumour in the Elderly

A 61-year-old male presented with a painful swelling in the right knee lasting for two months. On examination, a tender, tense swelling measuring 4x4 cm around the knee joint was observed. On investigation, complete blood count and peripheral smear were within normal limits. MRI (Magnetic Resonance Imaging) of the knee joints showed a large lobulated mass throughout the knee joint and suprapatellar bursa in the distal thigh, suggestive of a synovial neoplasm. Tc99 MDP whole body scan shows no evidence of osteoblastic metastasis (Fig 3). The clinical diagnosis was synovial sarcoma. Excision biopsy of the mass was performed. Received multiple pieces of grey-tan membraneous tissue, the largest measuring 4x2x1cm (Fig 4). The microscopic examination shows uniform small round blue cells in a vague lobular pattern with scant clear to eosinophilic cytoplasm. (Fig 1)