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Arch Otolaryngol Head Neck Surg. 2005;131:826-827.

	Since this article does not have an abstract, we have provided the first 150 words of the full text and any section headings.

Diagnosis: Hairy (dermoid) cyst originating from the eustachian tube

A dermoid cyst originating from the eustachian tube is a rare congenital anomaly, with only 14 cases reported in the literature, to our knowledge.^1-2 Most cases occur in females and in the left ear.² Approximately 7% of all dermoids develop in the head and neck area, and more than 50% of these are found in the periorbital region and 13% in the nasal cavity.³ Although dermoids are considered benign developmental malformations, their location within the relatively inaccessible eustachian tube, with resultant obstruction, can cause significant morbidity.⁴

The most popular hypothesis regarding histogenesis suggests that dermoids of the eustachian tube originate from errors in ectodermal inclusions at the site of contact of the endodermal surface of the first pharyngeal pouch and the ectodermal surface of the first branchial cleft.⁵ At approximately the fourth to fifth weeks of gestation, the endodermal lining of the first pharyngeal pouch (from which the tympanic cavity . . . [Full Text of this Article]

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Arch Otolaryngol Head Neck Surg. 2005;131(9):823.
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