Medulloblastoma is the more frequent malignant cerebral tumor in childhood. This is an observational study of a retrospective cohort in which there were included all the patients diagnosed of medulloblastoma in the last 19 years (1989-2007) in Hospital de Cruces of Baracaldo, Vizcaya, Spain. There were included 37 patients, 20 men and 17 women, with ages between 1 and 48 years (average age 13.7 years with standard deviation 11.4). Tumor site and mortality according to initial dissemination were variables of statistic significance. Metastases were detected at diagnosis in two patients. The surgical resection was total in 75% of the patients. A relapse was diagnosed in the follow-up in 59.5% of the patients, with a positive spinal fluid in 27%. Sequelae were detected in 100% of the survivors, mainly with cerebellar and ocular alterations. One patient developed a meningioma and a maxillary sarcoma at the long term follow-up. It is important to emphasize the aggressiveness of medulloblastoma in both children and adults, with a global mortality of 56.8% and 48,6% at 5 years. It is considered necessary a multidisciplinary treatment and a long term monitoring of the patients and the sequelae of the survivors, including the possibility of second tumours.