case_images: PMC11141765_01
case_images: (A) A well-defined semicircular red plaque surrounded by a large pigmented patch is present on the lateral aspect of the right upper arm. (B) Day 10 after surgical removal of skin lesions.
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case_images: Additionally, stripes of atrophic lines were observed near the armpit (Figure 1).
case_images: (A) Hyperkeratotic epidermis, mild epidermal thickening, and heterogeneous mononuclear cells in the lower epidermis (HE x100). (B) Cells with large, darkly stained, irregular nuclei with perinuclear halos aggregated into nests resembling Pautereum microabscesses. Banded lymphocytes and histiocytes were observed in the superficial dermis (HE x200).
case_images: CCID-17-1245-g0002.jpg
case_images: PMC11141765_01_CCID-17-1245-g0002.jpg
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case_images: Banded lymphocytes and histiocytes were observed in the superficial dermal layer (Figures 2A and B).
case_images: Immunohistochemistry showed positive staining (60%) for CD3 (A), CD4 (B), CD5 (C), CD8 (D), CD30 (E), and Ki-67 (F) CD7 (G) showed partial positivity.
case_images: CCID-17-1245-g0003.jpg
case_images: PMC11141765_01_CCID-17-1245-g0003.jpg
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case_images: CD3, CD4, CD5, CD8, CD30, and Ki-67 (60%). CD7 showed partial positivity (Figure 3A-G), while PD-1, CD20, and CD79alpha were negative.