Pleurisy Causes & Risk Factors. Causes and Risk Factors for Pleurisy. Pleurisy can develop as a complication of several conditions. In some cases, the condition is idiopathic (i.e., occurs with no known cause). The most common cause for pleurisy is viral infection (e.g., influenza, pneumonia).
An extrarenal pelvis is a normal variation from the usual anatomy, and it does not indicate a state of disease. However, renal pelvises do not usually protrude in such a manner, and it may appear as if there is a blockage in the renal pelvis that is preventing urine from emptying, which is a serious medical condition.
A long, prismatic, slightly curved bone, the shorter and thicker of the two forearm bones, located laterally to the ulna. radius. Plural radii (rÄ'dÄ-Ä«') or radiuses. A line segment that joins the center of a circle or sphere with any point on the circumference of the circle or the surface of the sphere. It is half the length of the diameter. The shorter and thicker of the two bones of the forearm or the lower portion of the foreleg. See more at skeleton.