At present, there are 4 common types of congenital MRMVs, known as MRMV1 to MRMV4.[6,7] MRMV1 is linked to heterozygous loss-of-function mutations in the deleted in colorectal cancer (DCC) gene located on chromosome 18q21 and is often accompanied by agenesis of the corpus callosum (ACC) in some cases.[8] MRMV2 results from mutations in the RAD51 gene on chromosome 15q15, typically presenting as involuntary MRMVs in the hands and forearms, sometimes causing mild functional impairments. This evidence concerns the gene DCC and colorectal cancer.