BIOPHOTO ASSOCIATES / SCIENCE PHOTO LIBRARY BIOPHOTO ASSOCIATES / SCIENCE PHOTO LIBRARY
Light micrograph of a section through human skin afflicted with a Cicatricial basal-cell carcinoma, an aggressive variant of the common skin tumour that arises from the basal cells of the epidermis. Although the cancer behaves malignantly by invading the underlying dermis it almost never metastasizes (spreads to other tissues). Basal cell carcinomas occur mostly on areas of skin exposed to light, particularly the face. The lesions are commonly known as rodent ulcers.
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