What are the clinicopathologic types of basal cell carcinoma?

• Nodular: Cystic, pigmented, keratotic; the most common type of BCC; usually presents as a round, pearly, flesh-colored papule with telangiectases • Infiltrative: Tumor infiltrates the dermis in thin strands between collagen fibers, making tumor margins less clinically apparent • Micronodular: Not prone to ulceration; may appear yellow-white when stretched, is firm to the touch, and may have a seemingly well-defined border • Morpheaform: Appears as a white or yellow, waxy, sclerotic plaque that rarely ulcerates; is flat or slightly depressed, fibrotic, and firm • Superficial: Seen mostly on the upper trunk or shoulders; appears clinically as an erythematous, well-circumscribed patch or plaque, often with a whitish scale