Adenoma of Ceruminal Glands

ICD-O:8420/0

Adenomas are unusual neoplasms that present with a blockage of the lateral part of the external auditory me-atus, often associated with deafness and discharge. An important part of the clinical investigation of all glandular neoplasms of the ear canal is exclusion of an origin in the parotid gland.

Gross appearances are those of a superficial grey mass up to 4 cm in diameter, which is covered in skin. Microscopically this neoplasm lacks a definite capsule. It is composed of regular glands often with intraluminal projections (Fig. 8.4). The glandular epithelium is bilayered, the outer layer being myoepithelial, but this may not be obvious in all parts of the neoplasm. The glands are often arranged in groups surrounded by fibrous tissue. In some ceruminomas, acid-fast fluorescent pigment may be found in the tumour cells that is similar to that found in normal ceruminal glands [15, 125].

Adenoma of ceruminal glands is a benign neoplasm. Recurrence should not be expected if it is carefully excised.

Fig. 8.4. Ceruminoma of the external canal. Note peg-like pro- Fig. 8.5. Osteoma of the deep external canal. Reproduced from trusions into the lumina, indicating apocrine secretion. Repro- Michaels and Hellquist [68] duced from Michaels and Hellquist [68]

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