case_images: PMC8897609_01
case_images: Colonoscopy showing the rectal tumor.
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case_images: PMC8897609_01_f1000research-10-121500-g0000.jpg
case_images: f1
case_images: The colonoscopy showed a tumor highly suspicious for malignancy with a central depression of 25 mm ( Figure 1).
case_images: Magnetic resonance imaging scan showing the rectal tumor.
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case_images: f2
case_images: T2 without metastasis to lymph nodes or distant metastasis ( Figure 2). The histopathologic examination of the rectal lesion showed a primary signet ring cell carcinoma that was histologically distinct from the appendiceal tumor.
case_images: Timeline of events.. CT; computed tomography.
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case_images: PMC8897609_01_f1000research-10-121500-g0002.jpg
case_images: f3
case_images: Figure 3 presents a timeline of the events.