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.
Definition of a bulging disc: Sometimes the disc does not actually rupture but bulges due to a weakening of the outer part of the disc that lets the inner fluid to push against the weakened wall and cause a bulge. Bulging discs are considered a normal part of aging. Bulging discs often cause no problems, but if a bulging disc protrudes against a spinal nerve root, back pain can result. A bulging disc is more susceptible tearing, and becoming a herniated disc. Definition of a herniated disc: A herniated disc is a rupture of the outer casing of the disc.