PRIMARY MUSCLE LYMPHOMA

Primary muscle lymphoma is rare, Less than 50 cases have been describe d. The clinical and radiological features of muscle lymphoma are prese nted in this series of six cases, Most patients present with solitary or multiple masses which may be painful, Clinical presentation varies from the indolent to the rapidly progressive, Systemic symptoms occur in a minority. In most eases, ultrasound shows an ill-defined hypoecho ic mass but apparent coarsening of fibroadipose septa and swelling of muscle bundles may occur, CT shows an iso/hypo dense mass, On MR the m ass appears iso/minimally hyperintense to muscle on T1W and enhances, and hyperintense on T2W, proton density and fat suppression sequences, Infiltration of the subcutaneous fat is a striking feature in a major ity of cases on CT and MR, The diagnosis can be established by ultraso und guided biopsy and should be performed urgently in HIV positive pat ients to exclude pyomyositis.