Monarch Disease Ontology term MONDO_0010792 (lethal infantile mitochondrial myopathy) is a rare mitochondrial oxidative phosphorylation disorder characterized by progressive generalized hypotonia, progressive external ophthalmoplegia and severe lactic acidosis, which results in early fatality (days to months after birth). Patients may present with lethargy and areflexia and may associate additional features, such as cardiomyopathy, renal dysfunction, liver involvement and seizures. Also known as: LIMD, LIMM, lethal infantile mitochondrial disease.