hemivertebra


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Related to hemivertebra: spina bifida occulta

anomaly

 [ah-nom´ah-le]
marked deviation from normal. adj., adj anom´alous.
Axenfeld's anomaly a developmental anomaly characterized by a circular opacity of the posterior peripheral cornea, and caused by an irregularly thickened, axially displaced Schwalbe's ring.
congenital anomaly (developmental anomaly) absence, deformity, or excess of body parts as the result of faulty development of the embryo.
Ebstein's anomaly see ebstein's anomaly.
May-Hegglin anomaly a rare dominantly inherited disorder of blood cell morphology, characterized by RNA-containing cytoplasmic inclusions (similar to Döhle bodies) in granulocytes, by large, poorly granulated platelets, and by thrombocytopenia.

hem·i·ver·te·bra

(hem'ē-ver'tĕ-bră),
A congenital defect of the vertebral column in which one side of a vertebra fails to develop completely due to failure of the chondrification center to form on this side. This produces scoliosis (lateral curvature of the vertebral column).

hemivertebra

/hemi·ver·te·bra/ (hem″e-ver´tĭ-brah)
1. a developmental anomaly in which one side of a vertebra is incompletely developed.
2. a vertebra that is incompletely developed on one side.
Hemivertebra.

hemivertebra

[-vur′təbrə]
an abnormal condition characterized by the congenital failure of a vertebra to develop completely. It is possibly caused by the complete failure of the growth center of one vertebral body. Usually half of the vertebra involved is completely or partially developed, and the other half is absent. One or more vertebrae may be involved. The different conditions produce varying degrees of balanced or unbalanced scoliosis. As a result of the developmental abnormality of the spine, a wedge-shaped vertebra develops, and adjacent vertebral bodies expand to fit the deformity or tilt to accommodate wedge-shaped articulation. Hemivertebra may be classified according to the degree of developmental failure of involved vertebral growth centers. When two vertebral bodies are involved and growth centers on the same side fail to develop, moderate to severe unbalanced congenital scoliosis results. When growth centers fail to develop on opposite sides, balanced congenital scoliosis results. Singular hemivertebra may cause few if any signs and symptoms. Depending on the degree of congenital scoliosis involved, any associated deformity may become more apparent with growth. Other types of hemivertebra, especially those involving unbalanced congenital scoliosis, usually progress markedly with growth and have a relatively poor prognosis unless early spinal fusion prevents further spinal curvature. No treatment may be required for the form of the condition associated with balanced congenital scoliosis.

hemivertebra

Orthopedics A congenital vertebral body defect arising from a simple–ie, nondysplastic, nonmetabolic embryonal defect, in which the anterior half of a vertebral body is absent and adjacent vertebrae expand to fill the void, accompanied by preservation of interspaces. See Vertebra. Cf Butterfly vertebra.

hem·i·ver·te·bra

, pl. hemivertebrae (hem'ē-vĕr'tĕ-bră, -brē)
A congenital defect of a vertebra in which one side of a vertebra fails to develop completely.

hemivertebra

a developmental anomaly in which one side of a vertebra is incompletely developed. Occurs commonly in British bulldogs, Boston terriers and the Pug without clinical effects, but occasionally leads to invertebral disk herniation, vertebral luxation or spinal cord compression.
Enlarge picture
Typical mid-thoracic hemivertebra. By permission from Kirberger RM, Wrigley RH, Barr F, Dennis R, Handbook of Small Animal Radiological Differential Diagnosis, Saunders, 2001
References in periodicals archive ?
Iskelet displazisi dusunulerek cekilen rontgenogramlarda; radius ve ulnada, tibia ve fibulaya oranla daha belirgin olan mezomelik kisalik (Resim 2A), torakal duzeyde multipl hemivertebra, kostalarda fuz-yon gorunumleri vardi (Resim 2B).
Diastometamyeli'li hastalarin en az %50'sinde spina bifida okulta, hemivertebra, kongenital bar, skolyoz gibi vertebra anomalileri gorulur (7).
Structural scoliosis can be caused by neuromuscular diseases (such as cerebral palsy, poliomyelitis, or muscular dystrophy), birth defects (such as hemivertebra, in which one side of a vertebra fails to form normally before birth), injury, certain infections, tumors (such as those caused by neurofibromatosis, a birth defect sometimes associated with benign tumors on the spinal column), metabolic diseases, connective tissue disorders, rheumatic diseases, or unknown factors (idiopathic scoliosis).