- Etiology: rhabdoid cells are hallmark but only comprise fraction of tumor
- Imaging: heterogeneous (cysts, hemorrhage, calcification), off midline in 50%, cerebellar (50%) > supratentorial
- Complications: 20% with CSF metastases at presentation
- Clinical: medulloblastoma look alike in infants < 2 years old (typical medulloblastoma age is 5 years old), consider ATRT when large brain tumor found in child < 3 years old
