 Approximately, 40% of the known cases are AMHR2 mutations, on the AMH Receptor Type 2 gene, which is on chromosome 12 (Type 2 PMDS).The remaining unknown 15% are referred to as ‘Idiopathic PMDS’.PMDS is usually overseen because of the external symptoms such as the cryptorchidism and inguinal hernias, being assumed to be the only complication.