However, soft-tissue abnormalities in EAC can include atresia, edema, hemorrhage, keratosis obturans, cholesteatoma, adenoma, ceruminoma
, fibroma, mixed tumors, as well as squamous cell, basal cell, and adenocystic carcinoma .
Ceruminous adenoma, also called ceruminoma
, ceruminal adenorna, apocrine adenoma, or even cylindroma in the past (the latter three terms are discouraged) is a benign glandular neoplasm of ceruminous glands (modified apocrine sweat glands) that arises solely from the external auditory canal.
In 1972, Wetli et aP described the nomenclature that has become widely accepted to differentiate benign from malignant tumors that were previously all designated as ceruminoma
. They separated the tumors into 4 types: (1) ceruminous gland adenocarcinoma, (2) ceruminous adenoma, (3) adenoid cystic carcinoma, and (4) pleomorphic adenoma.
(1) Until recently, controversy over its histologic origin and debate concerning its appropriate designation have led to inappropriate diagnosis of this lesion as ceruminoma
, ceruminous adenocarcinoma, ectopic salivary gland tumor, adenocarcinoma, and other entities.