Long Term Follow-up on Menkes Disease Patients

Inclusion Criteria: * The subject must have been previously identified and/or enrolled under Protocols 09-CH-0059 or 90-CH-0149; or An untreated Menkes disease patients for whom data collection is incomplete under Protocols 09-CH-0059 (Amendment M); or Other untreated Menkes disease patients. * Must sign and date an informed consent form by parent or legal guardian for this study prior to any assessment being done in this study. If the patient is \> 18 years of age, the patient must sign the informed consent. * Male or female, aged 0 to \< 65 years of age. Exclusion Criteria: \- Unwillingness/unable to participate in the study.