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Precocious puberty (PP) is a rare presentation of intracranial pathology unrelated to the pituitary. PP in this setting is considered a paraneoplastic phenomenon, achieved through synthesis of sex-hormones by the tumor itself or via alterations in the release of gonadotrophins from the pituitary. The latter has been described with masses adjacent to the pituitary or with those which cause hydrocephalus. We describe a case of a choroid plexus papilloma (CPP) without hydrocephalus presenting as precocious puberty. An 18 month-old female presented with 4-months of weight loss, bilateral galactorrhea and constipation. Her weight decreased from the 15th to below the 1st percentile. CBC, celiac and thyroid studies were normal. Prolactin was at the upper limit of normal (25.8;ref 3.3–26.3). Breast ultrasound demonstrated symmetric breast tissue development. She was referred to pediatric gastroenterology for constipation and failure to thrive. Caloric supplementation, bowel regimen and barium enema were recommended. One week later, she was admitted with dehydration, painful constipation and further weight loss in the setting of an acute febrile illness. MRI revealed a normal pituitary and an intraventricular mass without hydrocephalus. She underwent gross total resection of the mass, later determined to be a choroid plexus papilloma. The patient’s galactorrhea resolved abruptly following resection. Because of her galactorrhea, our patient underwent neuroimaging revealing an incidental mass without associated hydrocephalus. To our knowledge, precocious puberty and hyperprolactinemia have not been described in neoplasms distant from the pituitary. Thus, these lesions should be recognized as a potential etiology of precocious puberty and hyperprolactinemia.

RARE-49. CHOROID PLEXUS ADENOMA WITHOUT ASSOCIATED HYDROCEPHALUS PRESENTING AS PRECOCIOUS PUBERTY