Steatocystoma simplex. A solitary steatocystoma

Abstract

Steatocystoma simplex, an entity not previously described, to my knowledge, occurred in 16 women and 14 men. Eleven cysts were situated on the face, six on the limbs, and five on the chest. The clinical diagnosis was usually some type of cyst. The lesions contained yellow fluid. Microscopic findings showed a partially collapsed, thin-walled cyst lined by stratified squamous epithelium with a thick, undulating hyaline cuticle and sebaceous glands in or near the wall. When compared with steatocystoma multiplex and dermoid cysts, the differential features of steatocystoma simplex included its solitary nature, occurrence in adulthood, lack of family history, and intracutaneous location. Just as other dominantly inherited syndromes of multiple benign adnexal tumors, such as cylindromas, trichoepitheliomas, and trichilemmomas, have their counterparts in nonheritable solitary tumors, so steatocystoma multiplex has its parallel in steatocystoma simplex.

A Case of Steatocystoma Simplex Involving the Scalp

“…Steatocystoma simplex is a soft, movable intracutaneous cyst with a distinct boundary. To distinguish steatocystoma simplex from steatocystoma multiplex, it is important to make sure that the lesion is solitary and occurs in adulthood with a non-heritable pattern 1 . Steatocystoma simplex can occur on various parts of the body, but most commonly on the face and the chest.…”

“…The upper limbs and axillae are also relatively common sites of occurrence. Rarely, steatocystoma simplex can occur on relatively uncommon sites, such as the back, leg, oral cavity, perineum, and scalp 1,5,6 . Four cases of steatocytoma simplx have been reported and only one case has been reported to involve the scalp in the Korean medical literature (Table 1 .…”

“…Large, flattened sebaceous glands were within or near the cyst wall. If there is a hyaline cuticle in the cystic wall, it can be shown to be a steatocystoma simplex, even in the absence of sebaceous glands 1,4 . The differential diagnosis of steatocystoma simplex includes steatocystoma multiplex, a dermoid cyst, cystic sebaceous hyperplasia, and hidrocystoma.…”

“…The individual lesion of steatocystoma simplex is usually identical with that of steatocystoma multiplex, both clinically and histologically, but is characterized by solitary, nonheritable growth in adulthood 1 . Steatocystoma simplex occurs predominantly on the face, but the incidence of steatocystoma simplex on the scalp is extremely low.…”

“…Steatocystoma simplex occurs predominantly on the face, but the incidence of steatocystoma simplex on the scalp is extremely low. Only three cases of steatocystoma simplex on the scalp have been reported worldwide [1][2][3] . We report an additional case of steatocystoma simplex which was developed on the right parietal scalp.…”