Spastic Paraplegia 56, Autosomal Recessive, with or Without Pseudoxanthoma Elasticum, also known as spastic paraplegia 56, autosomal recessive, is related to hereditary spastic paraplegia 56 and hereditary spastic paraplegia. An important gene associated with Spastic Paraplegia 56, Autosomal Recessive, with or Without Pseudoxanthoma Elasticum is CYP2U1 (Cytochrome P450 Family 2 Subfamily U Member 1). Affiliated tissues include brain and thymus, and related phenotypes are babinski sign and lower limb hyperreflexia