What are the common defects of segmentation

Block vertebra, unilateral bar, and unilateral bar and hemivertebra (Fig. 42-1).

Defects of Segmentation

Block vertebra

Unilateral bar

Unilateral bar & hemivertebra

cQ,

cgob

r^v ojC

Bilateral dF'g

Unilateral

failure of 9 b

Ja┬╗ M failure of

segmentation ^Lp

segmentation

jff

cvior

cjoop

Figure 42-1. Defects of segmentation. (From McMaster MJ. Congenital scoliosis. In: Weinstein SL, editor. The Pediatric Spine: Principles and Practice. New York: Raven Press; 1994. p. 227-44, with permission.)

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