MR FEATURES OF AN INTRACEREBELLAR CHLOROMA

Granulocytic sarcoma (chloroma) is a rare tumor almost always associat ed with leukemia. Intraaxial brain lesions are rare, and can mimic inf ection or primary neoplasm. This intracerebellar chloroma arose after autologous bone marrow transplantation in a 29-year-old woman with leu kemia. On T1-weighted MR images, the lesion was isointense with gray m atter, and enhanced homogeneously, On T2-weighted and proton density-w eighted MR sequences, the center was isointense with gray matter and t he periphery was isointense with white matter. The lesion's tendency t o remain isointense on sequences with long repetition times is presuma bly attributable to the presence of myeloperoxidase.