Basal Cell Hyperplasia

Epidemiology:

Common sites:

Gross features:

Histologic features:

• small solid nests with or without central lumen
• cytologically similar to normal basal cells
• often pallisading at edges
• may have prominent nucleoli
• may form a distinct nodule (“basal cell adenoma”)
• may have cribriform pattern
• lack of desmoplastic response, perineural invasion, necrosis, or widespread infiltration into surrounding tissue

Immunophenotype:

Marker:

Sensitivity:

Specificity:

Molecular features:

Other features: