PMP22 and hereditary neuropathy with liability to pressure palsies: Duplication and deletion of 1.4 Mb in 17p12, including PMP22, were first reported to be associated with peripheral neuropathies of Charcot–Marie–Tooth disease type 1A (CMT1A) and hereditary neuropathy with liability to pressure palsies (HNPP), respectively1,2.