Testicular Neoplasm in Identical Twins

Abstract
THE SIMULTANEOUS and/or subsequent occurrence of neoplasms of a given organ system in twins is an uncommon event. The most frequently reported sites are the hematopoietic tissues, soft-tissue sarcomas, Wilms' tumor, glial tumors, and melanomas. In addition there are other well-defined familial syndromes associated with neoplasia. We report the discovery and treatment of ipsilateral testicular neoplasms in 21-year-old identical twin men. The father had been exposed to atomic radiation in the South Pacific nine months before the conception of the twins. The measured badge radiation was within "tolerance limits." This is the seventh reported case of testicular neoplasms in twins and the fifth set of monozygotic twins.1 Report of Cases Case 1.— A 21-year-old mentally retarded (IQ, 74) male twin was admitted to Kaiser Foundation Hospital, Los Angeles, in October 1974 because of an enlarged left testicle found during routine physical

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