PMC3304074_01
Abdominal CT indicated enlargement of the descending colon wall within the intussusception (arrows), suggesting the existence of a tumor in the head. a Transverse slice. b Sagittal slice.
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F1
At his visit to our hospital, CT revealed a 'target mass' in the descending colon, suggesting the existence of a tumor in the head of the intussusception (fig. 1), whereas colonoscopic examination had revealed normal results in June 2008.
The surgical specimen contained a 5.3 x 3.5 cm protuberant tumor that was thought to be the lead point of the intussusception. The ischemic area of the wall was 16 cm along the anal side of the tumor.
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F2
Macroscopically, the surgical specimen contained a 5.3 x 3.5 cm protuberant tumor at the proximal edge of the 16-cm-long ischemic area in the descending colon (fig. 2).
Microscopic examination. a The tumor was a poorly differentiated adenocarcinoma with invasion into the subserosa (hematoxylin-eosin staining, x100). b-d The tumor was partially positive for chromogranin A, KIT, and CD56 by immunohistological staining (x100).
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F3
Microscopic examination revealed poorly differentiated adenocarcinoma with invasion into the subserosa and ischemic wall on the anal side of the tumor by hematoxylin-eosin staining (fig. 3a). The tumor was partially positive for chromogranin A, KIT, and CD56 by immunohistological staining, resulting in an adenocarcinoma with neuroendocrine features (fig. 3b-d).