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Clinical Problem Solving: Pathology
Aug 2012

Pathology Quiz Case 2: Diagnosis

Author Affiliations


Arch Otolaryngol Head Neck Surg. 2012;138(8):780. doi:10.1001/archotol.138.8.780

Diagnosis: Hidrocystoma of the external auditory canal

Tumors derived from sweat glands represent approximately 1% of all primary skin lesions,1 with 85% to 90% reported as benign.2 Hidrocystomas are rare, cystic, nonneoplastic, tumorlike papules or nodules of the sweat glands that are commonly found in the head and neck region.3 Based on their histologic features, hidrocystomas may be classified as either eccrine or apocrine.3,4

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