case_images: PMC11100488_01
case_images: Pilomatricomas on the right upper arms of twin 1 (A) and twin 2 (B) visualized with irregular nodules (black circles).
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case_images: Monozygotic twins, 7 years old, presented to our department with a palpable, painless, and solid mass in the subcutaneous tissue of the upper right limb on August 14, 2019 (Figure 1).
case_images: Intraoperative specimen.
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case_images: The mass presented a firm texture and a grayish-white color, with well-circumscribed boundaries (Figure 2).
case_images: Photomicrographs showed epithelial islands consisting of basaloid matrix cells and ghost cells (Hematoxylin & eosin; bar scale: 50 mum); Basaloid matrix cells (black arrow) exhibiting hyperchromatic nuclei without scant cytoplasm. Ghost cells (green arrow) characterized by pale and eosinophilic appearance, and center empty zone.
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case_images: Histological examination revealed the presence of basophilic basaloid cells and ghost cells, confirming the diagnosis of pilomatricoma (Figure 3).