PMC9971617_01
Colonoscopy shows an elevated tumorous lesion in the descending colon.
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F1
Additionally, the endoscopic image revealed atypical findings (two humps and elevation of the submucosa) with regard to typical colorectal cancer (shown in Fig. 1).
Macroscopic evaluation of the resected specimen. An elevated tumor measuring approximately 50 mm in diameter is observed in the descending colon (arrowhead).
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F2
No lymph node metastasis was detected (shown in Fig. 2, 3).
Histology of the tumor excised from the descending colon. a Intraoperative frozen section of the tumor showing solid growth of clear cells admixed with glandular and cystic growth of cells with hobnail features. b Histopathology of the paraffin-embedded specimen showing the cytoplasm of the tumor cells more clearly and brightly than the intraoperative frozen section (hematoxylin and eosin stain, magnification x20).
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F3
No lymph node metastasis was detected (shown in Fig. 2, 3).