RYR1 and Malignant hyperthermia: The association with malignant hyperthermia (MH) is not as well documented as in CCD due to dominant RYR1 mutations [27], but clinical MH episodes have been recognized in few cases with MmD [28,29]; minicores have also been noted in muscle biopsies from families with MH susceptibility due to RYR1 mutations but no other clinical features of a congenital myopathy [30,31].