Lhermitte-Duclos disease (LDD) is a very rare disorder characterized by abnormal development and enlargement of the cerebellum, and an increased intracranial pressure. The disease is Lhermitte-Duclos disease (MONDO_0019002). Also known as: LDD, dysplastic cerebellar gangliocytoma, dysplastic gangliocytoma of cerebellum, dysplastic gangliocytoma of the cerebellum.