PMC8449722_01
(a) The preoperative CT scan shows a stricture of the sigmoid colon. (b) A resection of the sigmoid colon was performed and the segment sent for histological analysis.
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fig1
Resection of the rectosigmoid colon with colorectal anastomosis was performed (Figures 1(a) and 1(b)).
(a) All four tumors from the resected colon segment were composed of solid sheets of spindle and epithelioid neoplastic cells (H&E, 100x magnification). (b) At higher magnification, prominent nucleoli and mitotic figures are visible (H&E, 400x magnification). (c) The tumor cells showed strong positive immunohistochemical staining with the endothelial marker CD31 (200x magnification). (d) Staining for ERG confirmed the tumors' endothelial origin (200x magnification).
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fig2
TTF-1, PAN-CK, ALK, Mpox, S-100, and DOG1 (Figures 2(a)-2(d)).
A CT scan following the surgery showed multiple residual tumors in the lower abdomen and pelvis. (a) Front abdominal wall. (b) Psoas muscle. (c) Gluteus. (d) Iliac bone.
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fig3
A CT scan showed multiple residual tumors in the lower abdomen and pelvis measuring up to 6.5 cm in the greatest diameter, with signs of massive hemorrhage within them (Figures 3(a)-3(d)).