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[Reliability of clinical diagnosis in malignant melanoma].

During the last 10 years (1981-1990) 14,178 skin tumors were histologically examined in the Department of Dermatology of the University Medical School of Szeged. Of these lesions 520 were diagnosed clinically and histologically as malignant melanoma (true-positive). 104 lesions were clinically diagnosed as malignant melanoma but were found histologically to be other tumors (false-positive). An additional 78 cases diagnosed clinically as other than malignant melanomas, were found histologically to be malignant melanoma (false-negative). The clinical diagnostic accuracy was 74.07%. The index of suspicion was 104.34%, thus demonstrating a slight degree of "overdiagnosis". The sensitivity, specificity and predictive values were consonant with those of the literature.