Pathogenic monoallelic variants in the COL11A1 gene are primarily linked to autosomal dominant Stickler syndrome type II (STL2) MIM #604841, Marshall syndrome (MRSHS) MIM #154780, and non-syndromic hearing loss (ADNSHL) at the DFNA37 locus MIM #618533 [17]. The gene discussed is COL11A1; the disease is Marshall syndrome.