Sclerosing basal cell carcinoma of skin

**Definition:** This form of basal cell carcinoma is composed of thin strands, cords and columns of malignant cells which infiltrate between collagen bundles of the dermis. It may infiltrate widely and deeply before it becomes clinically obvious. It typically starts as a pale, poorly-defined indurated plaque which may not come to medical attention until it starts to bleed and crust.