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Biopsy site selected for different types of lesions. (A) Pedicled lesions: biopsy should be performed on head of the lesion, not the pedicle; (B) Lumpy lesions: biopsy should be performed at the top of the lesion, not at the base of the lesion; (C) Ulcerative lesions: biopsy should be performed on the inside of the ulcer, not on the bottom or outside of the ulcer.
