TK2 and Facioscapulohumeral dystrophy: The adult myopathy shares prominent facial weakness with facioscapulohumeral muscular dystrophy (FSHD).18 29 We suggest that genetically undiagnosed patients with autosomal recessive myopathies, including FSHD-like cases, should be screened for TK2 mutations in blood or mitochondrial alterations in muscle biopsies.