We describe a male newborn who presented with a nodular mass in the right testicle. The alpha-fetoprotein level was greater than 450 ng. per ml. Scrotal ultrasound showed a multicystic "swiss-cheese"-appearing mass replacing most of the testicle, which suggested a teratoma. An operation was postponed until the physiological jaundice subsided. At orchiectomy a juvenile granulosa cell tumor of the testis was removed.
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Uehling et al. (1987) studied this question.
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