Abstract
CONGENITAL anomalies in twins are relatively common, but the findings of bilateral cryptorchism in identical twins is unusual enough to prompt this report. The monozygotic character of these twins is suggested by (1) the striking similarity in their speech and general appearance; more particularly by the similar color of the skin and eyes, the same size and shape of the hands and feet, identical skeletal proportions and whorl of scalp hair; (2) statement of the grandmother who witnessed the birth and reported that only one placenta was delivered; (3) identical response to treatment, as will be shown later. Other observations of monozygocity were not made nor deemed essential to the clinical objectives. The twins (Leonard M. and Seymour M.) were first admitted to the clinic in July, 1942, at the age of 10, because of bilateral cryptorchism, mild stunting of growth, and underweight. They were markedly overactive and complained of anorexia and constipation.

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