Basal cell carcinoma occurring in scar tissue following excision of a parotid gland pleomorphic adenoma.

Background: A 49-year-old patient presented with a basal cell carcinoma growing on scar tissue left following excision of a parotid gland pleomorphic adenoma.

Objective: The objective was to determine whether the basal cell carcinoma had resulted from tumor spillage at the time of the pleomorphic adenoma excision.

Methods: Substantial evidence is presented linking the two tumors.

Results: The basal cell carcinoma most likely occurred as the result of tumor spillage at the time of the parotid gland pleomorphic adenoma excision.

Conclusions: Cutaneous connective tissue stroma plays a significant role in determining the differentiation of basal cell carcinomas.