Nodular basal cell carcinoma of skin

**Definition:** This is the most common form of basal cell carcinoma and is typically located on the head or neck. It starts as a small translucent nodule which will frequently necrose and ulcerate as it enlarges. Telangiectatic blood vessels can often be detected just under the tumour surface. A minority may be pigmented and give rise to difficulty in distinguishing them from melanoma.