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Magnetic resonance imaging showing rectal neoplasm (A) and perirectal nodes (B).
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Melan-A expression were found. MRI revealed circumferential thickening due to rectal lesion with a 7.2 cm length and 1.8 cm thickness, leading to narrowing of the rectal lumen located 3.2 cm away from the anus and several enlarged perirectal nodes (Figure 1).
The rectum, the large nodes, and the tumor after an abdominalperineal resection.
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An abdominoperineal resection was performed because a substantial part of the internal anal sphincter was invaded (Figure 2).
Anal melanoma. Cross-section of the external surface region (H&E x 100).
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Histology (Figures 3, 4, 5) confirmed a malignant metastatic, epithelioid melanoma in 13 of the 14 examined lymph nodes.
Anal melanoma. Cross-section of the mucosa surface region (H&E x 100).
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Histology (Figures 3, 4, 5) confirmed a malignant metastatic, epithelioid melanoma in 13 of the 14 examined lymph nodes.
Anal melanoma. Cross-section of the tumor region (H&E x 400).
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Histology (Figures 3, 4, 5) confirmed a malignant metastatic, epithelioid melanoma in 13 of the 14 examined lymph nodes.