A Case of Steatocystoma Simplex Involving the Scalp: CASE REPORT

A 49-year-old man presented to our outpatient clinic with an asymptomatic papule on the right parietal scalp which had been present for about 1 year. The lesion had slowly enlarged a few months ago. The physical examination revealed a skin- colored, deep-seated, soft cystic mass on his right parietal scalp, 0.9 cm in diameter (Fig. 1). There was no remarkable family history of similar lesions. Clinically, the lesion appeared to be a trichilemmal cyst, and was completely excised. The histological examination revealed an undulating, configured cystic mass that was empty. The cyst was located in the dermis and the cystic walls were thin and lined by stratified squamous epithelium that lacked a stratum granulosum (Fig. 2A). The cyst contained eosinophilic hyalinized cuticle in the lumen and flattened sebaceous gland lobules close to the cystic wall (Fig. 2B). There have been no signs of re­currence or development of other cysts during the 4 month follow-up.

Fig. 1. A solitary, 0.9×0.9 cm

Fig. 1. A solitary, 0.9×0.9 cm skin-colored papule on the parietal scalp (arrow).

(A) The cyst was located in the dermis and the cystic walls were thin and lined by stratified squamous epithelium (H&E, x12.5). (B) Large, flattened sebaceous lobules were within the cystic wall. A hyalinized inner lining and lacking stratum granulosum were seen (H&E, x100).
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Fig. 2. (A) The cyst was located

Fig. 2. (A) The cyst was located in the dermis and the cystic walls were thin and lined by stratified squamous epithelium (H&E, x12.5). (B) Large, flattened sebaceous lobules were within the cystic wall. A hyalinized inner lining and lacking stratum granulosum were seen (H&E, x100).

Category: Health

Tags: Scalp, Steatocystoma simplex

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