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.
1 A herniated disc is a circumstance where the core of the disc has herniated and has pushed it is way through the outer wall of the disk and is now protruding out of the spinal canal. 2  Many patients who have a bulging disc experience no pain unless the disc becomes herniated and puts pressure on a nerve.