Summary— The case histories of 2 patients with erythema gyratum repens (E.G.R.) are presented. In common with all previous reports, both were found to have a hitherto unsuspected underlying neoplasm, one having an adenocarcinoma of the bladder and the other a prostatic carcinoma. It is suggested that a simple and useful diagnostic aid in the differentiation of E.G.R. from other figurate erythemas, is to outline the lesions and observe them daily.
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Thomson et al. (1970) studied this question.
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