Spastic Paraplegia 63, Autosomal Recessive, also known as hereditary spastic paraplegia 63, is related to pontocerebellar hypoplasia, type 9 and paraplegia. An important gene associated with Spastic Paraplegia 63, Autosomal Recessive is AMPD2 (Adenosine Monophosphate Deaminase 2). Affiliated tissues include brain and skeletal muscle, and related phenotypes are spasticity and hyperreflexia