PMC7125469_01
Transverse colon mass seen on abdominoplevic scan and PET-scan (FDG).
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A positron-emission tomography (PET) scan revealed a hypermetabolic mass adjacent to the wall of the transverse colon (Figure 1).
Transverse colon mass during colonoscopy.
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A colonoscopy was then performed, and a 3 cm indurated lesion was noted in the transverse colon (Figure 2).
Follow-up abdominoplevic CT scan revealing a suspicious enlarged 2 cm mesenteric lymph node and PET-scan showing a high FDG uptake of the enlarged mesenteric lymph node.
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This lymph node showed hypermetabolism on the PET-scan with a maximum standardized FDG-uptake value (SUV) of 7.1 (Figure 3).
Hematoxylin and eosin stain, enlarged 20x, lymph node infiltrated with tumor cells and hematoxylin and eosin stain, enlarged 100x, findings suggestive of leiomyosarcoma found within the mesenteric lymph node.
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Histopathology showed a neoplastic proliferation of pleomorphic spindle cells arranged in fascicular and storiform patterns, compatible with a leiomyosarcoma (Figure 4).
Hematoxylin and eosin stain, enlarged 100x, vascular involvement of the tumor within the mesenteric lymph node.
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One lymph node out of seven (1/7) was found to harbor a metastatic focus, which seemed to stem from adjacent vascular invasion (Figure 5).