Birth Defects - Syndromes - Malformations - Anomalies
- O
- OAV Dysplasia
- OAVS
- Obrinsky
- Oculo auriculo vertebral Spectrum
- OEIS
- Olfactogenitals of de Morsier
- Olfactory Lobe
- Oligophernia
- Omphalocele
- Onychoosteodysplasia
- Opitz
- Oral-facial Cleft
- Organification Thyroid Hormone Defect
- Osseous fragility
- Osteopsathyrose idiopathique
- Osteogenesis Imperfecta
- Osteogenesis Imperfecta congenita Vrolik
- Osteogenesis Imperfecta tarda
- Osteomalacia congenita
- Osteomyopathia
- Osteoporosis foetalis
- Osteopsathyrosis ideopathica Lobstein
- Osteopsathyrosis foetalis
- Osteitis parenchymatosa chronica
- Ovarian dwarfism
- Ovarian dwarfism as part of Turner
- Oxycephaly
- Oxycephaly Virchow's