Trichilemmal cyst

Case contributed by Dalia Ibrahim
Diagnosis almost certain



Patient Data

Age: 50 years
Gender: Female

Non-contrast CT scan of the brain showed no intracranial pathology.

Incidentally noted left occipital scalp subcutaneous lesion showing coarse calcification. Intact underlying calvarium. A diagnosis of trichilemmal cyst was made.

Case Discussion

Trichilemmal cysts (TC) are keratin-filled cysts with a wall resembling the external root sheath of a hair follicle. They are the most common subcutaneous cysts of the scalp.

On imaging, these lesions can be either a cystic or solid mass which may show internal foci of calcifications.

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