PMC6402199_01
Gross appearance of the tumor. Photograph showing a soft reddish protruding lesion at the entry of the external auditory canal.
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Otoscopic examination revealed a soft reddish protruding lesion at the posterosuperior portion of the entry to the right external auditory canal (Figure 1).
Computed tomography of the temporal bone. The axial view (A) and coronal view (B) demonstrate a dense, protruding, soft tissue lesion overlying the cartilage in the posterosuperior portion of the entry of the external auditory canal, without mastoid or middle ear lesions.
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Computed tomography of the temporal bone showed a dense, protruding soft tissue lesion of the skin overlying the cartilage of the external auditory canal, but there was no evidence of the mastoid or middle ear lesions (Figure 2).
Histopathology of the tumor. Luminal structures (arrow) and inflammatory granulation (asterisk) below pseudoepitheliomatous hyperplasia (arrow head) (hemotoxylin and eosin (HE) stain, x40) (A). Luminal structures (asterisk) containing eosinophilic cytoplasm proliferated in the middle to the deep layer of the epidermis (HE staining, x40) (B). The luminal structures were composed of dual cell layers consisting of inner luminal secretory cells with apical decapitation secretion (arrow) and outer myoepithelial cells (HE staining, x200) (C).
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The skin lesion was endaurally resected; pathologic examination showed luminal structures in the middle to deep layer of the epidermis and inflammatory granulation below pseudoepitheliomatous hyperplasia (Figures 3(a) and 3(b)). The walls of the luminal structures consisted of inner luminal secretory cells and outer myoepithelial cells (Figure 3(c)).