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BACKGROUND Rubinstein–Taybi syndrome (RTS) is characterized by multiple congenital anomalies and associated with mutations in CREBBP (70%) and EP300 (5–10%). Previous reports have suggested an increased incidence of benign and possibly also malignant tumors, but the correlation remains unclear. Here we present a case of a patient with RTS and medulloblastoma. CLINICAL CASE: A 5-year-old male presented with increased intracranial pressure. An MRI revealed a 4.2 x 4.7 cm mass in the midline of cerebellum arising from the floor of 4th ventricle. The patient underwent a complete resection and pathology revealed medulloblastoma, classic histology. Staging established no disseminated disease. At diagnosis, a peculiar phenotype consisting in mild mental retardation, microcephaly, down-slanting palpebral fissures, broad nasal bridge, highly arched palate, mild micrognathia, screwdriver incisors and wide thumbs and toes was noted. Clinical genetics evaluation was consistent with RTS. Karyotype was performed and normal. Further genetics testing was not done. Treatment consisted in 8 cycles of chemotherapy and craniospinal radiation (2300 cGy to spine, 5500 cGy Total). At the end of treatment, there was no evidence of disease. He was under surveillance for 33 months free of disease, but relapsed with a supratentorial meningeal disease that ultimately resulted in death. CONCLUSION This report highlights the fact that pediatric medulloblastoma can be associated to RTS, in this case associated to classical histology and recurrent disease.

LINC-16. MEDULLOBLASTOMA IN A BOY WITH RUBINSTEIN-TAYBI SYNDROME: A CASE REPORT