title: A Rare Case of a Pilar Cyst With Ductal Differentiation.
abstract: Pilar cysts are common squamous-lined cysts that typically occur on the scalp. They are believed to arise from the isthmus of anagen hairs or from the sac surrounding catagen and telogen hairs. The authors describe a rare case of a pilar cyst with prominent ductal differentiation, presumably of eccrine derivation. Sweat duct differentiation has been described in a myriad of cutaneous neoplasms and rarely within epidermoid cysts. The authors could only find one other case in the literature describing a pilar cyst with sebaceous and apocrine differentiation. The clinicopathologic findings are described here.
authors.affiliation: *Department of Pathology and Laboratory Medicine, Beth Israel Deaconess Medical Center, Boston, MA; †Department of Pathology and Laboratory Medicine, David Geffen School of Medicine at UCLA, Los Angeles, CA; and ‡San Diego Pathology Medical Group, Inc, San Diego, CA.
authors.forename: Vanda F
authors.initials: VF
authors.lastname: Torous
authors.forename: Albert
authors.initials: A
authors.lastname: Su
authors.forename: Scott W
authors.initials: SW
authors.lastname: Binder
authors.forename: Seong H
authors.initials: SH
authors.lastname: Ra
mesh_terms: D002454:Cell Differentiation; D004814:Epidermal Cyst / Q000473:pathology*; D005260:Female; D006801:Humans; D008875:Middle Aged; D012535:Scalp / Q000473:pathology; D012536:Scalp Dermatoses / Q000473:pathology*; D013545:Sweat Glands / Q000473:pathology*