pineal parenchymal tumor of intermediate differentiation (MONDO_0006369, a Monarch Disease Ontology id) is a WHO grade II or III pineal parenchymal neoplasm of intermediate-grade malignancy, affecting all ages. It is composed of diffuse sheets or large lobules of uniform cells with mild to moderate nuclear atypia and low to moderate level mitotic activity. (Adapted from WHO). Also known as: pineal parenchymal tumor of intermediate differentiation (morphologic abnormality), pineal parenchymal tumour of intermediate differentiation (morphologic abnormality).