Obesity Osteosarcoma Ornithine Carbamoyltransferase Deficiency Disease Osteoporosis-pseudoglioma syndrome Oculodentodigital Dysplasia Otospondylomegaepiphyseal dysplasia Osteogenesis imperfecta, type 3 Osteopetrosis with renal tubular acidosis Osteopathia striata cranial sclerosis Osteogenesis imperfecta, type 4 Osteogenesis Imperfecta, Type IX Osteogenesis Imperfecta Type VII Oculoauricular Syndrome Osteogenesis Imperfecta Osteoporoses Optic Atrophy, Hereditary, Leber Osteopetrosis, Autosomal Recessive 1 Osteopetrosis, Autosomal Recessive 4 Opitz GBBB Syndrome, X-Linked Osteogenesis imperfecta, type 6 Osteogenesis imperfecta, type 2A Osteogenesis imperfecta, type VIII Oculocerebrorenal Syndrome Opitz-Kaveggia syndrome Occipital horn syndrome Osseous Heteroplasia, Progressive Optic Atrophy, Autosomal Dominant Ocular Albinism type 1 Osteogenesis imperfecta, Levin type Osteopetrosis, mild autosomal recessive form Ovalocytosis, Malaysian-Melanesian-Filipino Type Osteopetrosis, Autosomal Recessive 5 Osteopetrosis, Autosomal Recessive 6 Ovotesticular Disorders of Sex Development Osteogenesis imperfecta, type 5 Osteolysis hereditary multicentric Opsismodysplasia Osler-rendu-weber syndrome 2 Omani type of spondyloepiphyseal dysplasia Oculomelic amyoplasia Orofaciodigital syndrome 6 Optic atrophy polyneuropathy deafness Osteolysis, Hereditary, Of Carpal Bones With Or Without Nephropathy Osteoglophonic dwarfism Odontoonychodermal dysplasia Orofaciodigital syndrome 4 Oculomaxillofacial dysostosis Oculocutaneous albinism type 1B Oliver-McFarlane syndrome Osteopetrosis, Autosomal Recessive 7 Optic nerve coloboma Opitz trigonocephaly syndrome Optic atrophy and cataract, autosomal dominant Oligodontia-Colorectal Cancer Syndrome Omodysplasia type 1 Orofacial Cleft 11 Omodysplasia 2 Oculocutaneous albinism type 1 Optic Nerve Hypoplasia, Bilateral Orofacial Cleft 5 Osteopetrosis autosomal dominant type 1 Oto-palato-digital syndrome, type 2 Ovarian Dysgenesis 2 Optic atrophy 5 Orstavik Lindemann Solberg syndrome Ossification of the posterior longitudinal ligament of the spine Orofaciodigital syndrome 5 Optic Atrophy 7 Obesity, Hyperphagia, and Developmental Delay Oculodigitoesophagoduodenal syndrome Oguchi disease Oculocutaneous albinism type 3 Oroticaciduria 1 Otocephaly Oto-Palato-digital syndrome type 1 Oculopalatoskeletal syndrome Otofaciocervical Syndrome Oculootoradial syndrome Orthostatic Intolerance Odontohypophosphatasia Olivopontocerebellar hypoplasia, fetal-onset Oligodendroglioma Osteitis Deformans Ovary Syndrome, Polycystic Occlusion, Retinal Vein Oculodentodigital Dysplasia, Autosomal Recessive O'Donnell Pappas syndrome Orofaciodigital Syndromes Oncocytoma, renal Osteoarthritides Osteopetroses Osteopoikiloses Ophthalmoplegia, Chronic Progressive External Orofacial Cleft 10 Osteochondrodysplasia Oligospermia Ossification, Heterotopic Osteoporoses, Postmenopausal Otitis Media with Effusion Obstruction, Ureteral Orofaciodigital syndrome, Shashi type Orofacial Cleft 8 Orofaciodigital syndrome type1 Osteomalacia Otodental Dysplasia Oral Ulcer Opsoclonus Myoclonus Syndrome Osteofibrous Dysplasia Optic atrophy, X-linked Orofacial Cleft 1 Oligomenorrhea Oliguria Ophthalmoplegia Opisthorchiases Optic Nerve Disease Orthomyxoviridae Infections Osteochondroma Osteonecroses Osteoscleroses Otitis Media Obstruction, Ventricular Outflow Osteoporosis, juvenile Obesity, Abdominal Orofaciodigital syndrome 3 Overweight Olfaction Disorder Organophosphate Poisonings Orofaciodigital syndrome 9 Osteopoikilosis, Isolated Osteopetrosis and infantile neuroaxonal dystrophy Optic Atrophy Spastic Paraplegia Syndrome Optic atrophy 6 Optic atrophy 1 and deafness Optic Atrophy 4 Oculootodental Syndrome Ochronosis, hereditary Oral-facial-digital syndrome, type 2 Osteoporotic Fracture Osteophyte Orchitides Obstruction, Renal Artery Obstruction, Urethral Oligohydramnios Overnutrition Ocular Paraneoplastic Syndromes Ocular Motor Apraxia Otoscleroses Osteomyelitides Optic Disk Drusen Osteoma Odontogenic Tumors Onychomycoses Onycholysis Ovarian Fibromata Odontoma Oral Hemorrhage Osteochondroses Otitides Occlusion, Retinal Artery Osteochondromatoses Ovarian Germ Cell Cancer Oligosynaptic Infertility Oncogenic osteomalacia Overbite Orofacial Cleft 7 Optic Nerve Aplasia, Bilateral OI-EDS Combined Syndrome Optic Nerve Hypoplasia and Abnormalities of the Central Nervous System Osteonecrosis of the Jaws, Bisphosphonate Associated Ochronoses Osteitis Occlusions, Coronary Osteoid Osteomas Osteosarcoma, Juxtacortical Odontogenic Cyst, Calcifying Opticospinal Multiple Sclerosis Ocular Motility Disorder Onchocerciases Ophthalmia, Sympathetic Osteoblastoma Obesity-Hypoventilation Syndrome Ocular Toxoplasmoses Opacification, Capsule Ocular Onchocerciases Orofacial Granulomatosis Oculopharyngodistal Myopathy Oophoritides Osteitis Fibrosa Cystica Osteophytoses, Spinal Ocular Tuberculoses Oral Tuberculoses Osteoarticular Tuberculoses Odontodysplasia Osteoarthropathy of fingers familial Osteogenesis imperfecta, type 1A Orbital lymphoma Opium Dependence Ovarian gynandroblastoma Oculoauriculofrontonasal syndrome Odontoma dysphagia syndrome Orthostatic Hypotensive Disorder, Streeten Type Otosclerosis 2 Osteoarthritis, Spine Otopalatodigital Spectrum Disorder Oocyte Osteogenesis Ovary Oxidative Phosphorylation Osteopetrosis lethal Oculocerebral hypopigmentation syndrome type Preus