Abnormal malignant growth of the cells that comprise the pineal parenchyma. The disease is Monarch Disease Ontology term MONDO_0003249 (pineal gland cancer). Also known as: cancer of pineal body, malignant neoplasm of pineal body, malignant neoplasm of pineal gland, malignant neoplasm of the pineal gland, malignant pineal area neoplasm, malignant pineal area tumor, malignant pineal area tumour, malignant pineal body neoplasm.