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.
Herniated discs can occur in any part of the spine, but they are most common in the neck (cervical) and lower back (lumbar) spine. The seven vertebrae between the head and the chest make up the cervical spine. A herniated disc usually is caused by wear and tear of the disc (also called disc degeneration).