Ceruminous adenoma

These glands are found within the outer one third to one half of the external auditory canal, more common along the posterior surface; therefore, the tumor develops within a very specific location.

The tumor shows a dual or biphasic appearance, with glandular or cystic spaces showing inner luminal secretory cells with abundant granular, eosinophilic cytoplasm subtended by basal, myoepithelial cells at the periphery, adjacent to the basement membrane.

The luminal cells will often have decapitation (apocrine) secretions and will also have yellow-brown, ceroid, lipofuscin-like (cerumen) pigment granules.

[2][8] The tumors are usually removed in small pieces due to the anatomic confines of the area.

[2] Patients treated with complete surgical excision can expect an excellent long term outcome without any problems.

Hematoxylin and eosin stained slides shows a biphasic glandular proliferation with inner apocrine cells and basal myoepithelial cells, separated by fibrous connective tissue stroma.