Primary Malignant Melanoma of the Rectum: Report of Two Cases
Figure 1
Case 1 CT, FDG-PET, MRI, and pathological imaging. (a) CT shows that the tumor into the lumen. (b) FDG-PET shows that increased accumulation of FDG. (c) Macroscopic image of the rectal tumor showing pigmented lesions. (d) Histopathological examination of the rectal specimen showed the nest of melanocytic cells (e.g., HE stain, ×40). (e) Rectal specimen is positive for the expression of HMB-45 (×20). (f) CT shows multiple liver metastases.
