Proliferating trichilemmal cysts
Patient with cutaneous malignant melanoma, evaluation for metastases
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Multiple partially calcified subcutaneous ovoid masses of the scalp (hair-bearing portion).
Proliferating trichilemmal cysts, also known as pilar cysts or tumors, are slow-growing lobulated masses most commonly found on the scalp of elderly women. They form from hair follicle. The cysts are smooth, mobile and filled with keratin, a protein component found in hair, nails, and skin. Because of keratin, they have soft tissue density (higher HU values than simple cysts). They may have coarse calcification.
- Chang SJ, Sims J, Murtagh FR, McCaffrey JC, Messina JL. Proliferating trichilemmal cysts of the scalp on CT. (2006) AJNR. American journal of neuroradiology. 27 (3): 712-4. Pubmed