Macroamylasemia Malabsorption Malignant otitis externa Malignant plasmacytoma Mallory-Weiss tear Malnutrition Malposition of the uterus Mandibulofacial dysostosis Maple syrup urine disease Marfan syndrome Mass Mastocytoma Mastoiditis Maternal deprivation syndrome Mathematics disorder McCune-Albright syndrome Measles Meatal stenosis Meckels diverticulum Meconium aspiration (inhalation) Mediastinal emphysema Megarectum Meibomianitis Melanoma MEN I Meningitis Meningitis - meningococcal Meningitis - pneumococcal Meningitis - staphylococcal Meningitis - syphilitic Meningitis - tuberculous Meningococcal bacteremia Menopause Mental retardation Mesenteric artery ischemia Mesenteric venous thrombosis Mesothelioma (benign-fibrous) Mesothelioma (malignant) Metabolic neuropathies Metastatic pleural tumor Methemoglobinemia - acquired Methylmalonic acidemia Methylmercury poisoning MID Midcycle pain Midline granulomatosis Milia Milk-alkali syndrome Mineral metabolism disorders Mitral stenosis Mixed receptive-expressive language disorder Molluscum contagiosum Monilial vaginitis Mononeuritis multiplex Mononeuropathy Mortons neuroma Mouth ulcers MPS I S MPS III MS Mucormycosis Multifocal atrial tachycardia Multiple Endocrine Neoplasia (MEN) II Multiple system atrophy Munchausen syndrome by proxy Myasthenia gravis Mycoplasma pneumonia Myitis Myopathic changes Myopia Myotonia congenita