Seborrheic Keratosis (and Variants) Elsa F. Velazquez, MD Key Facts Macroscopic Features Sharply delineated plaques with greasy appearance Verruciform or flat surface Surface shows characteristic keratotic plugs From flesh-colored to…
Acantholytic and Acantholytic Dyskeratotic Acanthoma Christine J. Ko, MD Key Facts Clinical Issues Generally a solitary papule Often on trunk Often submitted as “rule out basal cell carcinoma” Microscopic Pathology…
Warty Dyskeratoma Christine J. Ko, MD Key Facts Clinical Issues Solitary (very rarely multiple) Umbilicated papule or nodule Often on head or neck Microscopic Pathology Cup-shaped lesion Sometimes associated with…
Pseudoepitheliomatous Hyperplasia Christine J. Ko, MD Key Facts Terminology Pseudoepitheliomatous hyperplasia (PEH) Florid proliferation of epidermis that mimics squamous cell carcinoma Etiology/Pathogenesis Tumors Inflammatory conditions Infections Tattoos Microscopic Pathology Hyperplasia…
Epidermal Nevus Jessica M. Comstock, MD Key Facts Terminology Developmental malformation of epidermis with keratinocytic hyperplasia Etiology/Pathogenesis Epidermal nevus syndrome includes neurological, ocular, and skeletal abnormalities Clinical Issues Common sites…
Branchial Cleft Cyst Lester D. R. Thompson, MD Key Facts Terminology Branchial cleft cyst refers to congenital developmental lateral cervical cyst derived from remnants of 2nd branchial apparatus Etiology/Pathogenesis Failure…
Bronchogenic Cyst Lester D. R. Thompson, MD Key Facts Terminology Rare congenital malformation of ventral foregut Clinical Issues Pediatric population, rare in adults Midline superficial presternal or suprasternal is most…
Digital Mucous Cyst Senait W. Dyson, MD David Cassarino, MD, PhD Key Facts Terminology Solitary, dome-shaped, skin-colored to translucent papule Synonyms: Digital myxoid cyst, digital synovial cyst Etiology/Pathogenesis Most view…
Hidrocystoma (Apocrine and Eccrine) Senait W. Dyson, MD David Cassarino, MD, PhD Key Facts Terminology Cystic, dome-shaped, translucent papules with bluish hue commonly found on the eyelids Etiology/Pathogenesis Most, if…
Milial Cysts Senait W. Dyson, MD David Cassarino, MD, PhD Key Facts Terminology Small epidermoid/infundibular cyst Clinical Issues Very common Primary milial cysts Occur spontaneously and typically seen on the…
