Cutaneous Keratocyst and Steatocystoma Unified as Sebaceous Duct Cyst, a Hamartoma Resembling the Sebaceous Duct

Odontogenic keratocysts located in the buccal mucosa: A description of two cases and review of the literature

“…The epithelial lining of keratocysts, whether located intra- or extraosseously, shows a striking similarity to the epithelial lining of the sebaceous gland duct. This similarity led Makhija 11 to propose a unifying terminology for cysts that appear to originate from the sebaceous duct epithelium: the cutaneous keratocyst and steatocystoma. He proposed the term ‘sebaceous duct cyst’.…”

“…The syndromic keratocysts also rarely occur in various skin locations. Because they are histologically similar in appearance to steatocystomas and appear to originate from the sebaceous duct, a unifying terminology of sebaceous duct cyst was proposed by Makhija 11 in 2015.…”

Sporadic Cutaneous Keratocyst of the Scalp: A Report of an Extremely Rare Lesion

“…CKCs are dermal-based cysts with no epidermal connection and exhibit parakeratinized epithelium of 2-5 cell layer thickness with a regimented basal cell layer and absent granular cell layer. These keratocysts exhibit normal maturation with a corrugated or festooned configuration but lack cutaneous adnexal structures, especially sebaceous glands, and sebaceous lobules, in the cystic wall, an important criterion for the distinction of CKCs from steatocystomas [1,7,8]. Thus, serial sectioning of tissue blocks is necessary to rule out steatocystoma.…”

Congenital cystic nodules on the ear of an 8‐month‐old infant

“…Recently, sebaceous duct cyst has been put forth as a unifying term for all cysts with eosinophilic, crenulated lining with or without sebaceous glands. Under this rubric, steatocystoma, sebaceous duct cyst and the entity known as cutaneous keratocyst, which demonstrates identical eosinophilic crenulated lining and has been described in the setting of basal cell nevus syndrome, 9 would all fall under the moniker sebaceous duct cyst 10 . Consensus on the terminology for these entities has yet to be reached.…”