Trichilemmal cyst

Case contributed by Pol Picart Royo
Diagnosis almost certain


Patient presenting to the emergency department for paresthesia in the left arm of 3 days' duration.

Patient Data

Age: 60 years
Gender: Male

Well-defined nodular lesion in the subcutaneous tissue of the left posterior cervical region, with discreetly heterogeneous density and scattered small punctiform foci of calcification. Features are suggestive of a trichilemmal cyst.

Case Discussion

Trichilemmal cysts are common, although there is a differential diagnosis.

In this case, the trichilemmal cyst measured less than 5 centimeters, and the patient did not explain progressive growth, making a proliferating trichilemmal cyst unlikely.

Epidermal inclusion cysts, which are rare in the scalp and pilomatricoma are more common in children and adolescents.

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