Which type of skin tumor is known for rarely metastasizing?

Basal cell carcinoma (BCC) is known for its very low potential for metastasis, which is a distinguishing feature of this type of skin tumor. BCC arises from the basal cells in the epidermis and is typically associated with chronic sun exposure. Although it can be locally aggressive and lead to significant local destruction of surrounding tissues if left untreated, BCC rarely spreads to distant sites or lymph nodes, making it less dangerous in terms of metastatic potential compared to other skin cancers.

In contrast, other skin tumors, such as squamous cell carcinoma, can metastasize, especially when they are poorly differentiated or found in certain high-risk locations. Melanoma is known for its significant metastatic potential, often spreading to distant organs early in its course, while atypical nevi can be precursors to melanoma and do carry some risk for transformation into melanoma. Overall, the distinctive characteristic of basal cell carcinoma is its very low likelihood of metastasis, which is why it is regarded as the correct answer in this scenario.