PMC4747482_01
Low power photomicrograph of the anal lesion. It shows the necrotic tumor comprising of proliferating stromal cells with peripheral palisading (Hematoxylin and Eosin stain; original magnification x 40)
PAMJ-22-161-g001.jpg
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F0001
The microscopic examination showed complete replacement of the tissue by a focally necrotic tumor that comprised proliferating stromal cells with peripheral palisading (Figure 1).
(A): Immunohistochemical stain patterns showing strong positivity for c-kit; (B): and moderate positivity for SMA (original magnification x 40)
PAMJ-22-161-g002.jpg
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F0002
Other immunohistochemical staining patterns reveal Ki-67 (6-8%) while protein S-100 and Pan CK were negative (Figure 2, Figure 3, Figure 4).
(A): Immunohistochemical stain patterns showing negativity for Pan CK; (B): and protein S 100 (original magnification x 40)
PAMJ-22-161-g003.jpg
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F0003
Other immunohistochemical staining patterns reveal Ki-67 (6-8%) while protein S-100 and Pan CK were negative (Figure 2, Figure 3, Figure 4).
Immunohistochemistry for Ki-67 showing some nuclear positivity (original magnification x 40)
PAMJ-22-161-g004.jpg
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F0004
Other immunohistochemical staining patterns reveal Ki-67 (6-8%) while protein S-100 and Pan CK were negative (Figure 2, Figure 3, Figure 4).