Brain Small Vessel Disease 1 with or Without Ocular Anomalies, also known as retinal arteriolar tortuosity, infantile hemiparesis, and leukoencephalopathy, autosomal dominant, is related to col4a1-related brain small-vessel disease and familial porencephaly, and has symptoms including hemiplegia, muscle spasticity and seizures. An important gene associated with Brain Small Vessel Disease 1 with or Without Ocular Anomalies is COL4A1 (Collagen Type IV Alpha 1 Chain). Affiliated tissues include brain and eye, and related phenotypes are corneal opacity and glaucoma