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Phocomelia is a congenital condition that involves malformations of human arms and legs which result in a flipper-like appendage. [1] [2] A prominent cause of phocomelia is the mother being prescribed the use of the drug thalidomide during pregnancy; however, the causes of most cases are to be determined. [2]
external causes during pregnancy (thus not inherited), e.g. via amniotic band syndrome; teratogenic drugs (e.g. thalidomide, which causes phocomelia) or environmental chemicals; ionizing radiation (nuclear weapons, radioiodine, radiation therapy) infections; metabolic imbalance
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Tethered spinal cord can be caused by various conditions but the main cause is when tissue attachments limit the movement of the spinal cord in the spinal column which causes abnormal stretching of the cord. The tethered spinal cord syndrome is correlated with having the causes: [10] Spina bifida. Occulta; Mylomeningocele; Meningocele
Roberts reported a disease that was characterized by phocomelia, cleft lip, cleft palate, and a protrusion of the intermaxillary region in three siblings of an Italian couple who were first cousins, which made Roberts syndrome acquisition more likely for their children due to the disease's autosomal recessive nature.
Genetic causes of birth defects include inheritance of abnormal genes from the mother or the father, as well as new mutations in one of the germ cells that gave rise to the fetus. Male germ cells mutate at a much faster rate than female germ cells, and as the father ages, the DNA of the germ cells mutates quickly.
Hecht Scott syndrome (also known as fibular aplasia–tibial campomelia–oligosyndactyly [FATCO] syndrome) is a rare genetic disease that causes congenital limb formation. [ citation needed ] The main characterisation is the aplasia or hypoplasia of bones (mainly the fibula or tibia ) of the limb. [ 1 ]
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