Fig. 3.

TSCC. In transit metastatic SCC is defined by the presence of dermal or subcutaneous papules or nodules that occur between the site of the primary tumor and lymph node basin. This patient (left) presented with in transit metastases 6 weeks after resection of a high-risk, primary SCC. Some patients with catastrophic carcinomatosis develop extensive field disease with confluent AK, in situ SCCs involving more than 50% body surface area (right). (From Belkin D, Carucci JA. Mohs surgery for squamous cell carcinoma. Dermatol Clin 2011;29(2):169; with permission.)