Basal cell carcinoma or not Basal cell carcinoma? That is the question!

: Basal cell carcinoma is the most frequent malignant tumor in mankind. Although diagnosis often is based on clinical signs confirmed by histopathology, there are simulators of this tumor and there are basal cell carcinomas with misleading clinical appearance. Here we present 4 samples that illustrate the challenge in diagnostics. We also discuss differential diagnosis and treatment.