SEXUAL PRECOCITY occurs frequently in girls with Albright's syndrome (polyostotic fibrous dysplasia of bone), but there are only five unequivocal cases reported in the literature describing this feature in boys.1-5Why it occurs at all in either sex is as yet unexplained. Examination of the gonads of patients who have presented sexual precocity has been carried out in only a few instances in prepubertal girls, and there has been no evidence of ovulation ever having occurred.6-8In the cases of prepubertal boys with Albright's syndrome who have shown sexual precocity, there is still less information: there are no reports concerning histology of the testes. The finding of mature spermatozoa in the case reported here not only confirms the sex precocity but also places the patient in the more specific category of true precocious puberty. Report of a Case A boy, 2 years and 5 months of age, was