Five cases of hidradenoma of the external auditory meatus: So‐called ceruminoma

Adenoid Cystic Carcinoma of the External Auditory Canal

“…These tumors are associated with a high risk of recurrence 1–5 and significant morbidities from surgical management 6 and adjuvant radiotherapy 7 . Because ACC of the EAC was first described in 1894, 8 numerous cases have been reported in the English‐language literature, 9–16 with some cases included in reports of ceruminoma, a term applied to all glandular neoplasms of the ear canal 11,17–21 …”

Posterior fossa ceruminoma

“…Histologically these tnmours closely resemble sweat gland tumours found in other parts of the body and Johnstone et al (1957) regard them as mental hidradenomata. They show, to variable degrees, the two-layered epithelial structure resembling that of sweat glands.…”

“…Previously described cases have shown a high incidienee of malignancy and even the eases showing uniformly well-differentiated features show a strong tendency to recur. This tendency is notably different to that of sweat gland tumours of the skin surface where only about 5 ~ behave in a malignant fashion (Johnstone et M. 1957).…”

Ultrastructural Morphology of a Middle Ear Ceruminoma

“…15]. Johnstone et al [16] commented on the high rate of local recurrence of the ceruminomas (50%) as compared with skin hidradenomas located elsewhere (5%).…”