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 spinal disc herniation commonly called a slipped disc, can happen when the gel-like material of the nucleus pulposus is forced against a weakness in the surrounding anulus fibrosus, putting pressure on the nearby nerve. This can give the symptoms of sciatica if it impinges on the roots of the sciatic nerve.