DOPA-responsive dystonia and hereditary spastic paraplegia (HSP) can present in asymmetric neurologic presentations with one side more involved in the early stages, and are conditions with identified genetic mutations in the GCH1 and ATL1 genes, respectively, but may be misdiagnosed as CP.40 The distinction is important, as DOPA-responsive dystonia can be treated with medications such as levodopa, and the clinical trajectory of HSP is different from that of CP as the neurologic symptoms progress. The gene discussed is GCH1; the disease is hereditary spastic paraplegia.