Systematic review of the histologic characteristics of skin lesions biopsied and/or resected in a group of 580 renal transplant recipients collected over a 16-year period showed a total of 170 specimens from 120 patients. In this group there were 41 benign tumors, 22 infections, 35 inflammatory dermatoses, and 13 miscellaneous lesions. Fifty-nine lesions were malignant, and half of these were squamous cell carcinomas (SCCs). None were lethal or metastasized, although deeply invasive local recurrences and multiple lesions were common. Comparison with SCCs from a control group showed no clearcut differences with respect to level of invasion, grade, pattern, or presence of actinic change. Most of these lesions were found in sun-exposed areas, were associated with actinic changes, and with actinic keratoses. Problems in differentiating SCC from keratoacanthoma and the clinical implications of these difficulties are discussed in conjunction with a review of the literature.
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