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…
Protocol for Specimens of Squamous Cell Carcinoma of the Skin David Cassarino, MD, PhD Squamous Cell Carcinoma of the Skin Biopsy, Excision, Reexcision, Lymphadenectomy Procedure ____ Biopsy, punch ____ Biopsy,…
Basal Cell Carcinoma David Cassarino, MD, PhD Key Facts Terminology Low-grade malignancy of basal keratinocytes Etiology/Pathogenesis Related to sun exposure, radiation, immunosuppression May be derived from follicular stem cells Clinical…
Squamomelanocytic Tumor Christine J. Ko, MD Key Facts Terminology Admixed histopathologic features of both squamous cell carcinoma and malignant melanoma Original descriptions were of dermal-based tumors Clinical Issues Very rare…
Extramammary Paget Disease Elsa F. Velazquez, MD Key Facts Terminology Extramammary Paget disease (EMPD) Clinical Issues Erythematous patches or plaques with sharply defined borders May clinically mimic chronic eczema Microscopic…
