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 ?
Hemivertebra resection for congenital scoliosis in young children comparison of clinical, radiographic, and health related quality of life outcomes between the anteroposterior and posterolateral approaches.
Scoliosis secondary to hemivertebra seven patients with gradual improvement without treatment.
En el punto de la union, se encontro estructura quistica que se concluyo era un meningocele (figura 1); orejas de implantacion baja, micrognatia (figura 2); en la radiografia se observo: retroflexion marcada de columna cervical, fusion de cuerpos vertebrales cervicales, hemivertebras toracicas e hipoplasia de: claviculas, ulnas y radios (figura 3).
4) El caso aqui reportado presento meningocele, hipoplasia de radio y ulnas, fusion y hemivertebras cervicotoracicas, siendo esta una presentacion poco comun.
Otros hallazgos poco frecuentes son; la micrognacia, las hemivertebras, las costillas cervicales, la espina bifica, el hueso homovertebral, la plagiocefalia, la concavidad toraxica, la atresia coanal, la anemia de Diamon-Blackfar, el pterigium coli y otras anormalidades craneo cervicales entre las que se destacan la hipermovilidad o inestabilidad de C1-C.
En las radiografias dorsal y toraco- lumbar se pudieron observar: fusion de las costillas 1-2 y 5-6 del lado derecho, presencia de hemivertebras en T1, T2, T3 y T4, hemi-vertebra entre L2 y L3, fusion de L3 y L4, roto-escoliosis derecha, espina bifida en sacro, en la caja toraxica se observan multiples deformaciones costales que hacen el torax asimetrico pero sin causar desviacion de las estructuras mediastinales.
La reparacion embrionaria incompleta de esta anormalidad resulta en un amplio espectro fenotipico que incluye a las hemivertebras, las vertebras en mariposa, la anomalia de Klippel-Feil y la agenesia sacra, todas malformaciones relacionadas con los DTN y la espina bifida.
Radiografia de columna vertebral: hemivertebras a nivel lumbar y presencia de vertebras en mariposa (figura 6).