Infant-Type Hemispheric Glioma

**Semantic type:** Neoplastic Process

**Definition:** A high-grade cellular astrocytoma that arises in the cerebral hemisphere and occurs in early childhood. It is characterized by receptor tyrosine kinase fusions in the NTRK family, ROS1, ALK, or MET genes. It includes the following subtypes: infant-type hemispheric glioma, NTRK-altered, infant-type hemispheric glioma, ROS1-altered, infant-type hemispheric glioma, ALK-altered, and infant-type hemispheric glioma, MET-altered.