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.
A herniated disc falls into the category of a non-contained disc disorder, whereas a bulging disc would be an example of a disc disorder that is contained. A bulging disc means that there is no tear or rupture in the annulus fibrosis (outer layer) of the intervertebral disc. A bulging disc is also known as a disc protrusion. Essentially, a small bubble of disc material protrudes into the spinal canal.