Other nasopharyngeal cysts include more lateral benign seromucinous retention cysts (Fig. 10), pharyngeal bursae of Luschka (between the longus colli muscle heads) and oncocytic cysts (Warthin's tumor, not reported in children).
Herniated Nucleus Pulposus. Definition. A herniated disc is a fragment of the disc nucleus which is pushed out of the outer disc margin, into the spinal canal through a tear or rupture.. In the herniated disc's new position, it presses on spinal nerves, producing pain down the accompanying leg. This produces a sharp, severe pain down the entire leg and into the foot.
Discussion. An important, frequently difficult to diagnose, type of disc herniation is a free disc fragment or sequestered disc herniation. A sequestered disc herniation occurs when extruded disc material is no longer contiguous with the parent nucleus pulposus.iscussion. An important, frequently difficult to diagnose, type of disc herniation is a free disc fragment or sequestered disc herniation. A sequestered disc herniation occurs when extruded disc material is no longer contiguous with the parent nucleus pulposus.