Dysmelia
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Dysmelia (from Greek Δύσ - = "bad" plus μέλος (plural μέλεα) = "limb") is a congenital disorder referring to the limbs. Dysmelia can refer to
- missing (aplasia) limbs: amelia, oligodactyly, congenital amputation
- malformation of limbs: ectrodactyly, phocomelia, syndactyly, brachydactyly, clubfoot
- too many limbs: polymelia, polydactyly, polysyndactyly
Occurrence rate
Birth defects involving limbs occur in 1 per 1000.
Causes
Dysmelia can be caused by
- inheritance of abnormal genes, e.g. polydactyly, ectrodactyly or brachydactyly, symptoms of deformed limbs then often occur in combination with other symptoms (syndromes)
- 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 (atomic weapons, radioiodine, radiation therapy)
- infections
- metabolic imbalance
Acknowledgement and Attribution Regarding Sources of Content
Some of the initial content on this page may be incorporated in part from copyleft sources in the public domain including wikis such as Wikipedia and AskDrWiki. Drug information for patients came from the The National Library of Medicine. Infectious disease information may have come from the Centers for Disease Control (CDC). Differential Diagnoses are drawn from clinicians as well as an amalgamation of 3 sources: 1.The Disease Database; 2. Kahan, Scott, Smith, Ellen G. In A Page: Signs and Symptoms. Malden, Massachusetts: Blackwell Publishing, 2004:3; 3. Sailer, Christian, Wasner, Susanne. Differential Diagnosis Pocket. Hermosa Beach, CA: Borm Bruckmeir Publishing LLC, 2002:7 .
