A grade I or grade II astrocytic tumor. This category includes pilocytic astrocytoma (grade I), subependymal giant cell astrocytoma (grade I), and diffuse astrocytoma (grade II). The disease is low grade astrocytic tumor (MONDO_0021638). Also known as: low grade astrocytic neoplasm, low-grade astrocytic neoplasm, low-grade astrocytic tumor, low-grade astrocytic tumour.