[Rare brain tumour in 6-month-old girl].

A six-month old girl presented with repetitive episodes of vomiting. Soon after admission to hospital she had convulsions. Computertomography showed a tumour in the third ventricle. She was non-radically operated. Histology showed an atypical teratoid/rhabdoid tumour (AT/RT). No active treatment was initiated, and the patient died three months later. AT/RT is a very rare tumor of the brain. It occurs primarily in early childhood. AT/RT is a very aggressive and rapidly progressing tumour.