It appears that, apart from the already established co-occurrence of GU-PD and MM, patients harboring PD-related mutations in genes like GBA (but not LRRK2), as well as asymptomatic GBA mutation carriers, are at risk of developing MM, with possible clinical implications in therapeutics and monitoring (including the need for frequent skin examination by an expert dermatologist). Here, LRRK2 is linked to Miyoshi myopathy.