PMC7739100_01
Clinical examined identified a 3 x 4 cm raised, indurated lesion with crusting, superficial ulceration and a serosanguinous discharge.
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It was raised, indurated, crusted, demonstrated a sparsity of hairs on the surface, had superficial ulceration and exuded serosanguinous fluid when pressed ( Figure 1).
Microscopic images of the skin tumour.. (
A) Squamous epithelium with trichilemmal keratinisation (x4 objective). (
B-
D) Epithelium with nuclear pleomorphism, mitoses and an infiltrative architecture (x20 objective).
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Microscopic examination of the lesion identified rounded dermal lobules of squamous epithelium with trichilemmal keratinisation in keeping with a pre-existing pilar cyst ( Figure 2A). Areas with nuclear pleomorphism, mitoses and an infiltrative architecture were noted, and they retained trichilemmal keratinisation ( Figure 2B-D).