PMC3603642_01
(a) Intussusception of the small bowel. (b) Exophytic pigmented mass. (c) Microscopic picture of the mass showing epithelioid cells with prominent nucleoli, brown pigment, and multiple mitotic figures (20 hpf). (d) Tumor cells are positive for Melan A (20 hpf).
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PMC3603642_01_CRIM.PATHOLOGY2013-672816.001.jpg
fig1
A 19 cm segment of small intestine was resected which showed an area of intussusception (Figure 1(a)). The specimen was opened to reveal an exophytic polypoid gray-purple mass measuring 4 x 3 x 1.5 cm causing the telescoping of the bowel segment (Figure 1(b)). Melanin pigment was abundant (Figure 1(c)). Immunohistochemically, the tumor cells were positive for S100, HMB 45 and Melan A (Figure 1(d)) supporting the diagnosis of metastatic malignant melanoma.