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Image Quiz! A 41 year old woman underwent a core needle biopsy for a 3 cm breast mass discovered on her first screening mammogram. The lesional spindle cells show the CD68 immunostaining pattern seen below; they are also positive for ALK and negative for SMA and desmin. (Cont.)

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Case of the Month: A 32 year old woman with a clinical history of complex partial type seizures underwent a brain MRI, which showed a 2 cm solid cystic lesion without contrast enhancement in the left temporal lobe.

Although the lesion remained stable over a 1 year follow up, the patient underwent surgery due to an increased frequency of seizures. The lesion was completely removed; the patient is in good health with no evidence of recurrence 1 year after surgery. What's your diagnosis?

Image of the Week! Submitted by: Asha Peedikayil Punnoose, M.D. Directory Profile: buff.ly/4iHMVb1 Subspecialty: Pediatric Diagnosis: Nephroblastoma #PathTwitter #PathologyOutlines #PediPath

Dr. Thomasson was appointed to the Board (Transfusion Medicine). He is Asst. Prof. of Pathology & Laboratory Medicine at BU Chobanian & Avedisian School of Medicine, Assoc. Dir. of BMC's residency program, and Med. Dir. of BMC's Blood Bank & Transfusion Service. (See comments)