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Case Reports
. 2019 Feb 8;2019(2):rjy354.
doi: 10.1093/jscr/rjy354. eCollection 2019 Feb.

Extra-gastrointestinal stromal tumor with a large cyst

Daichi Nakamura  1 , Yasushi Adachi  2 , Yousuke Kinjo  1   3 , Shigeki Uchida  1 , Tomohiro Sugiyama  1 , Noriko Sakaida  4   5 , Michihiko Tsubono  1 , Susumu Ikehara  6
Affiliations
Case Reports

Extra-gastrointestinal stromal tumor with a large cyst

Daichi Nakamura et al. J Surg Case Rep. .

Abstract

Gastrointestinal stromal tumors (GISTs) arising at sites other than the alimentary tract are rare, and they are called extra-GISTs (EGISTs). We report a case of a large EGIST forming a cyst, probably arising in the mesentery of the transverse colon. A 64-year-old Japanese man presented to a hospital with an abdominal tumor forming a large cyst. Intraoperatively, the tumor was neither present in nor in contact with the alimentary tract. It was present in the mesentery of the transverse colon and was attached to the greater omentum and peritoneum, immediately anterior to the body of the pancreas. The tumor was resected with the spleen and a part of the pancreas. Histological examination of the tumor revealed that it belonged to the high-risk category of cystic EGISTs.

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Figures

Figure 1:
Figure 1:
Image of abdominal CT Scan. CT scan revealed a tumor 180 mm in diameter in the region posterior to the gastric body. There was a large cyst in the tumor. Horizontal (A) and coronal (B) sections of the tumor are shown.
Figure 2:
Figure 2:
Macroscopic findings of the tumor. Anterior (A) and posterior (B) views of the resected tumor, pancreas, and spleen are shown. Cut sections of the tumor are also shown (C) (Bar = 5 cm). The tumor was resected, along with the pancreas and spleen.
Figure 3:
Figure 3:
Microscopic findings of the tumor. Loupe image of the tumor and pancreas (A), low-power view (B), high-power view (C) and expression of CD117 (c-kit) (D) and CD34 (E) are shown (B and C, ×10 and ×40 in the objective lens; D and E, ×20 in the objective lens).
See this image and copyright information in PMC

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