PMC6931023_01
Photograph showing a lesion located on the cymba conchae at the second visit 4 weeks later. The color of the tumor under the semitransparent overlying skin has changed from red to yellowish white.
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However, 4 weeks later, the redness had disappeared, and a yellowish white, irregular, semitransparent nodule with thin red-edged protrusions had emerged beneath the thin overlying skin (Figure 1).
Magnetic resonance imaging revealing a solitary, well-circumscribed 11 x 10 mm tumor that was isointense on T1-weighted (a) and T2-weighted (b) images. There was no diffusion restriction on diffusion-weighted imaging (not shown).
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MRI revealed a solitary, well-demarcated 11 x 10 mm lesion isointense on both T1-weighted (Figure 2(a)) and T2-weighted (Figure 2(b)) images, and there was no diffusion restriction on diffusion-weighted MRI, suggesting a benign entity.
The image of the excised tumor. (a) A well-circumscribed encapsulated nodule containing an irregularly shaped tumor was removed. (b) Tissue section showing islands of basaloid cells (asterisks) and shadow cells (arrowheads), clearly indicating a diagnosis of pilomatricoma (hematoxylin and eosin staining).
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Excision with 2 mm margins was performed, and a well-circumscribed encapsulated nodule containing a yellowish white, irregularly shaped tumor with a thin layer of overlying skin was removed (Figure 3(a)). Histological examination revealed lobulated structures containing clusters of basophils and abundant shadow/ghost cells, clearly indicating a diagnosis of pilomatricoma (Figure 3(b)).