Inverted Follicular Keratosis Senait W. Dyson, MD David Cassarino, MD, PhD Key Facts Terminology Inverted follicular keratosis (IFK) Benign tumor of follicular infundibulum Clinical Issues Common benign tumor found mostly…
Pilar Sheath Acanthoma David Cassarino, MD, PhD Key Facts Terminology Pilar sheath acanthoma (PSA) Mature adnexal proliferation composed of thickened epithelium with enlarged pale-staining keratinocytes Clinical Issues Usually in middle-aged…
Trichoblastoma David Cassarino, MD, PhD Key Facts Terminology Trichoblastoma (TB) Synonym: Giant trichoepithelioma Benign adnexal tumor showing primitive follicular differentiation Clinical Issues Head and neck area, especially the scalp Rare…
Dilated Pore of Winer David Cassarino, MD, PhD Key Facts Terminology Dilated pore of Winer (DPW) Enlarged follicular structure with acanthotic squamous lining and central keratin-filled space Etiology/Pathogenesis May be…
Tumor of the Follicular Infundibulum David Cassarino, MD, PhD Key Facts Terminology Tumor of the follicular infundibulum (TFI) Basal cell hamartoma with follicular differentiation Bland, superficial, plate-like adnexal proliferation with…
Panfolliculoma Steven D. Billings, MD Key Facts Microscopic Pathology Closely set solid and partially cystic structures with follicular differentiation Well circumscribed Follicular differentiation represents all areas of follicular unit Cystic…
Trichoepithelioma David Cassarino, MD, PhD Key Facts Terminology Trichoepithelioma (TE) Synonyms: Superficial trichoblastoma Basaloid follicular proliferation with a mixture of primitive follicular structures and mature infundibulocystic keratinizing areas Etiology/Pathogenesis Some…
Trichoadenoma Christine J. Ko, MD Key Facts Terminology Benign follicular tumor Clinical Issues Often on the face Solitary papule Microscopic Pathology Multiple mature cystic structures in dermis, showing epidermal-type keratinization…
Nevus Sebaceus and Follicular Hamartomas Steven D. Billings, MD Key Facts Clinical Issues Nevus sebaceus Usually presents on scalp in infancy, often at birth Presents as yellowish flat to warty…
Trichofolliculoma Steven D. Billings, MD Key Facts Clinical Issues Usually presents on the face Benign hamartomatous lesion Face is most common location Microscopic Pathology Cystic tumor that communicates to overlying…
