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©2013 UpToDate ® Print Email Aspergillus brain abscesses 44-year-old man with hairy-cell leukemia and biopsy-proved cerebral aspergillosis. (A) CT scan obtained after injection of contrast material shows multiple ring-enhancing lesions with surrounding edema and mass effect. (B) T2-weighted MR image (at slightly lower level than A) shows mutiple hypointense rings (arrows) with surrounding edema in right cerebral hemisphere. Rings are irregular and relatively poorly formed. From: Ashdown BC, Tien RD, Felsberg GJ. Aspergillosis of the brain and paranasal sinuses in immunocompromised patients: CT and MR imaging findings. AJR Am J Roentgenol 1994; 162:155. Reprinted with permission from: the American Journal of Roentgenology.