Mitochondrial neurogastrointestinal encephalomyopathy: diagnostic features of two patients.

Mitochondrial neurogastrointestinal encephalomyopathy is a rare, multisystem disorder characterized by gastrointestinal dysmotility, ptosis, neurologic findings (e.g., peripheral neuropathy), leukoencephalopathy, and thin body habitus. Gastrointestinal motility studies and skeletal muscle biopsy are recommended diagnostic tools. We report two patients that highlight the diagnostic characteristics of this rare entity.