Intracranial tumors originating in the region of the brain inferior to the tentorium cerebelli, which contains the cerebellum, fourth ventricle, cerebellopontine angle, brain stem, and related structures. Primary tumors of this region are more frequent in children, and may present with ATAXIA; CRANIAL NERVE DISEASES; vomiting; HEADACHE; HYDROCEPHALUS; or other signs of neurologic dysfunction. Relatively frequent histologic subtypes include TERATOMA; MEDULLOBLASTOMA; GLIOBLASTOMA; ASTROCYTOMA; EPENDYMOMA; CRANIOPHARYNGIOMA; and choroid plexus papilloma (PAPILLOMA, CHOROID PLEXUS).

Synonyms: Cancer, Infratentorial Infratentorial Neoplasms Posterior Fossa Tumor Malignant Infratentorial Neoplasm Malignant Infratentorial Neoplasms Infratentorial Neoplasms, Malignant Infratentorial Tumor Neoplasm, Posterior Fossa Infratentorial Neoplasm, Malignant Tumor, Posterior Fossa Infratentorial Neoplasms, Benign Tumors, Infratentorial Benign Infratentorial Neoplasms Infratentorial Neoplasm, Benign Posterior Fossa Neoplasm Infratentorial Cancers Neoplasms, Infratentorial Neoplasms, Malignant Infratentorial Neoplasm, Infratentorial Tumor, Infratentorial Cancers, Infratentorial Benign Infratentorial Neoplasm Tumors, Posterior Fossa Neoplasm, Benign Infratentorial Neoplasms, Benign Infratentorial Infratentorial Neoplasm Posterior Fossa Tumors Neoplasms, Posterior Fossa Infratentorial Cancer Infratentorial Tumors Neoplasm, Malignant Infratentorial Posterior Fossa Neoplasms