O-Ob

• O Doherty syndrome
• O Donnell Pappas syndrome
• Obesity
• Obesophobia
• Obsessive-compulsive disorder
• Obstructive asymmetric septal hypertrophy
• Obstructive sleep apnea

Oc

Occ-Och

• Occipital horn syndrome
• Occlusive Infantile ateriopathy
• Occult spinal dysraphism
• Occupational asthma
• Occupational asthma - Chemicals
• Occupational asthma - Metals
• Occupational asthma - Plants
• Occupational asthma - Wood dust
• Occupational asthma - Drugs
• OCD
• Ochoa syndrome
• Ochronosis, hereditary
• Ochronosis
• Ockelbo disease

Ocu

Ocul

Ocula

• Ocular Albinism
• Ocular coloboma-imperforate anus
• Ocular convergence spasm
• Ocular Histoplasmosis
• Ocular melanoma
• Ocular motility disorders
• Ocular toxoplasmosis

Oculo

• Oculo-auriculo-vertebral spectrum
• Oculo cerebral dysplasia
• Oculo cerebro acral syndrome
• Oculo cerebro osseous syndrome
• Oculo dento digital dysplasia
• Oculo digital syndrome
• Oculo facio cardio dental syndrome
• Oculo skeletal renal syndrome
• Oculo tricho anal syndrome
• Oculo tricho dysplasia

=Oculoa-Oculog=

• Oculoauriculofrontonasal syndrome
• Oculoauriculovertebral dysplasia
• Oculocerebral hypopigmentation syndrome Cross type
• Oculocerebral hypopigmentation syndrome type Preus
• Oculocerebral syndrome with hypopigmentation
• Oculocerebrocutaneous syndrome
• Oculocerebrorenal syndrome
• Oculocutaneous albinism immunodeficiency
• Oculocutaneous albinism type 1
• Oculocutaneous albinism type 2
• Oculocutaneous albinism type 3
• Oculocutaneous albinism, tyrosinase negative
• Oculocutaneous albinism, tyrosinase positive
• Oculocutaneous tyrosinemia
• Oculodental syndrome Rutherfurd syndrome
• Oculodentodigital dysplasia dominant
• Oculodentodigital syndrome
• Oculo-dento-digital syndrome
• Oculodentoosseous dysplasia dominant
• Oculodentoosseous dysplasia recessive
• Oculodigitoesophagoduodenal syndrome
• Oculo-gastrointestinal muscular dystrophy

=Oculom-Oculor=

• Oculomaxillofacial dysostosis
• Oculomaxillofacial dysplasia with oblique facial clefts
• Oculomelic amyoplasia
• Oculopalatoskeletal syndrome
• Oculopharyngeal muscular dystrophy
• Oculorenocerebellar syndrome

Od-Ok

• Odonto onycho dysplasia with alopecia
• Odontoma
• Odontomicronychial dysplasia
• Odontoonychodermal dysplasia
• Odontophobia
• Odontotrichomelic hypohidrotic dysplasia
• Odynophobia
• OFD syndrome type 8
• OFD syndrome type Figuera
• Ogilvie's syndrome
• Ohaha syndrome
• Ohdo Madokoro Sonoda syndrome
• Oikophobia
• Okamuto Satomura syndrome

Ol

• Olfactophobia
• Oligodactyly
• Oligodactyly tetramelia postaxial
• Oligomeganephronic renal hypoplasia
• Oligomeganephrony
• Oligophernia
• Oliver McFarlane syndrome
• Oliver syndrome
• Olivopontocerebellar atrophy deafness
• Olivopontocerebellar atrophy type 1
• Olivopontocerebellar atrophy type 2
• Olivopontocerebellar atrophy type 3
• Olivopontocerebellar atrophy
• Ollier disease
• Olmsted syndrome

Om-On

• Ombrophobia
• Omenn syndrome
• Omodysplasia type 1
• Omphalocele cleft palate syndrome lethal
• Omphalocele exstrophy imperforate anus
• Omphalomesenteric cyst
• Omsk hemorrhagic fever
• Onat syndrome
• Onchocerciasis
• Oncocytoma
• Ondine's curse
• Oneirophobia
• Onychonychia hypoplastic distal phalanges
• Onychotrichodysplasia and neutropenia

Op

Oph

• Ophthalmic icthyosis
• Ophthalmo acromelic syndrome
• Ophthalmomandibulomelic dysplasia
• Ophthalmophobia
• Ophthalmoplegia ataxia hypoacusis
• Ophthalmoplegia mental retardation lingua scrotalis
• Ophthalmoplegia myalgia tubular aggregates
• Opitz Mollica Sorge syndrome
• Opitz Reynolds Fitzgerald syndrome
• Opitz syndrome
• Opportunistic infections
• Oppositional defiant disorder
• Opsismodysplasia

Opt

• Opthalmoplegia progressive external scoliosis
• Optic atrophy opthalmoplegia ptosis deafness myopia
• Optic atrophy polyneuropathy deafness
• Optic atrophy, autosomal dominant
• Optic atrophy, idiopathic, autosomal recessive
• Optic atrophy
• Optic disc drusen
• Optic nerve coloboma with renal disease
• Optic nerve disorder
• Optic nerve hypoplasia, familial bilateral
• Optic neuritis
• Optic pathway glioma
• Opticoacoustic nerve atrophy dementia

Or

Ora-Orn

• Oral facial digital syndrome type 3
• Oral facial digital syndrome type 4
• Oral facial digital syndrome
• Oral facial dyskinesia
• Oral leukoplakia
• Oral lichen planus
• Oral lichenoid lesions
• Oral squamous cell carcinoma
• Oral submucous fibrosis
• Oral-facial cleft
• Oral-facial-digital syndrome, type IV
• Oral-facial-digital syndrome
• Oral-pharyngeal disorders
• Organic brain syndrome
• Organic mood syndrome
• Organic personality syndrome
• Ornithine aminotransferase deficiency
• Ornithine carbamoyl phosphate deficiency
• Ornithine transcarbamylase deficiency, hyperammonemia due to
• Ornithinemia
• Ornithosis

Oro-Ort

• Oro acral syndrome
• Orofaciodigital syndrome Gabrielli type
• Orofaciodigital syndrome Shashi type
• Orofaciodigital syndrome Thurston type
• Orofaciodigital syndrome type 2
• Orofaciodigital syndrome type1
• Orotic aciduria hereditary
• Orotic aciduria purines-pyrimidines
• Orotidylic decarboxylase deficiency
• Orstavik Lindemann Solberg syndrome
• Orthostatic intolerance

Os

Ose-Oss

• Osebold Remondini syndrome
• Osgood-Schlatter disease
• Oslam syndrome
• Osmed Syndrome
• Ossicular Malformations, familial

Ost

Oste

Ostei

• Osteitis deformans

Osteo

=Osteoa-Osteom=

• Osteoarthritis
• Osteoarthropathy of fingers familial
• Osteochondritis deformans juvenile
• Osteochondritis dissecans
• Osteochondritis
• Osteochondrodysplasia thrombocytopenia hydrocephalus
• Osteochondroma
• Osteocraniostenosis
• Osteodysplasia familial Anderson type
• Osteodysplastic dwarfism Corsello type
• Osteoectasia familial
• Osteogenesis Imperfecta
• Osteogenesis imperfecta congenita microcephaly and cataracts
• Osteogenesis imperfecta congenital joint contractures
• Osteogenesis imperfecta retinopathy
• Osteogenic sarcoma
• Osteoglophonic dwarfism
• Osteolysis hereditary multicentric
• Osteolysis syndrome recessive
• Osteomalacia
• osteomyelitis

=Osteon-Osteos=

• Osteonecrosis
• Osteopathia condensans disseminata with osteopoikilosis
• Osteopathia striata cranial sclerosis
• Osteopathia striata pigmentary dermopathy white forelock
• Osteopetrosis autosomal dominant type 1
• Osteopetrosis lethal
• Osteopetrosis renal tubular acidosis
• Osteopetrosis, (generic term)
• Osteopetrosis, malignant
• Osteopetrosis, mild autosomal recessive form
• Osteopoikilosis
• Osteoporosis macrocephaly mental retardation blindness
• Osteoporosis oculocutaneous hypopigmentation syndrome
• Osteoporosis pseudoglioma syndrome
• osteoporosis
• Osteosarcoma limb anomalies erythroid macrocytosis
• Osteosclerose type Stanescu
• Osteosclerosis abnormalities of nervous system and meninges
• Osteosclerosis autosomal dominant Worth type
• Osteosclerosis

Oster

• Ostertag type amyloidosis

Ot-Ox

• Ota Appaura syndrome
• Ota Kawamura Ito syndrome
• Oto palato digital syndrome type I and II
• Otodental dysplasia
• Otofaciocervical syndrome
• Otoonychoperoneal syndrome
• Oto-Palatal-digital syndrome
• Otopalatodigital syndrome type 2
• Otosclerosis, familial
• otosclerosis
• Otospondylomegaepiphyseal dysplasia
• Ouvrier Billson syndrome
• Ovarian cancer
• Ovarian carcinosarcoma
• Ovarian dwarfism as part of Turner Syndrome
• Ovarian dwarfism
• Ovarian insufficiency due to FSH resistance
• ovarian remnant syndrome
• Overfolded helix
• Overgrowth radial ray defect arthrogryposis
• Overgrowth syndrome type Fryer
• Overhydrated hereditary stomatocytosis
• Overwhelming post-splenectomy infection (OPSI)
• Oxalosis