9.All
are true regarding intervertebral disc except
a. annular rim and the ossification
centers in the vertebrae of newborn have
low signal intensity on T1- and T2-weighted images
b. nucleus
and annulus are sharply demarcated in the newborn.
c. during
the first two decades of life, the disc develops the fibrous structure that
characterizes the adult disc
d. The
vertebral body and the ring apophysis at time of transitional disc is not ossified completely
e. small
concentric and transverse tears are degenerative changes
9.---e
With
aging, small concentric and transverse tears develop in the annulus . The
former is characterized as delamination of the lamellae in the annulus fibrosus
with the development of a mucoid substance or fluid in the space. These tears
may be visualized on MR as a narrow band of higher-intensity signal, indicating
the location of the mucoid substance or fluid. The latter are short disruptions
in the annulus near the insertion of Sharpey fibers.
No comments:
Post a Comment