A rhombus is a quadrilateral with all 4 sides being the same length. For example, look at the chopped-off pyramid on the back of a U.S. one dollar bill. The front face you see under the eye is a trapezoid, since it has 4 sides, and the top parallel with the bottom. A square is one example of a rhombus, but you can have a rhombus that isn't a square.
Causes of Trigeminal Neuralgia. In many cases, the cause of TN is never found. According to the National Institute of Neurological Disorders and Stroke, although anyone can get TN, itâs more common among women than men. Itâs also more common in people over the age of 50, although it can occur at any age.
About two percent of trigeminal neuralgia patients harbor a tumor or some other sort of mass compressing the trigeminal nerve. â¢ Vascular compression in which a blood vessel causes compression on the trigeminal nerve in the region very close to the brain stem called the root entry zone. (fig.