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Recurrent rectal carcinoma. (a) A CT scan shows a large presacral mass that had yielded a negative biopsy result. The arrow shows the course of the needle biopsy. (b) PET and (c) fusion images show the discontinuous rim of the active tumor surrounding a necrotic center. Prior biopsy (arrrows show biopsy track) had passed through the zone of tumor into predominant necrosis. Repeat biopsy based on these images revealed tumor recurrence.
