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.
Disc herniation is a broad term describing specific changes in a lumbar disc. First, the disc itself needs to be addressed. A disc is the structure between the lumbar vertebral bodies (bones). The disc acts as a pad or cushion for the bone. The outer portion of the disc is made up of a tough fibro-cartilage matrix (the annulus) that is cross-linked in three different directions. In the middle, there is a gelatinous nucleus.