Solitary Extramedullary Plasmacytoma Masquerading as Osteomyelitis in an Elderly Male - A Rare Case Report

Extramedullary plasmacytoma is characterised by plasma cell proliferation in organs or tissues outside the bone marrow. It originates from B lymphocytes with 60% cases arising in nasal cavity, paranasal sinus and nasopharynx. Extramedullary plasmacytoma corresponds to less than 10% of all plasmacytic tumors representing less than 1% of all head and neck tumors. Typically affects 5th to 7th decade of life having male predominance in Caucasian population. Global incidence is 1 case per 5,00,000 people. This is a rare case of extramedullary plasmacytoma of the soft tissue around the knee a highly uncommon site in an elderly male. Key words: Extramedullary plasmacytoma, soft tissue knee