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.
Intervertebral Disc Protrusion. An intervertebral disc protrusion is another diagnostic term for a herniated disc. Protrusion is a term usually reserved for significant disc bulges, in which the herniation extends past the normal boundaries of the vertebral bones. Most protrusions are not problematic and might even shrink back considerably on their own.