system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Basal cell carcinoma commonly spreads by-
assistant
The correct answer is  Harshmohan textbook of pathology 7th edition. even though basal cell carcinoma is a malignant one, it spread to the surrounding tissues , (locally aggressive cutaneous tumour) and that rarely metastasis. .