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.
pelvis. n, pl-vises or-ves (-viËz). 1. (Anatomy) the large funnel-shaped structure at the lower end of the trunk of most vertebrates: in man it is formed by the hipbones and sacrum. 2. (Anatomy) the bones that form this structure.3. (Anatomy) any anatomical cavity or structure shaped like a funnel or cup. 4. (Anatomy) short for renal pelvis.. pelvis-a structure shaped like a funnel in the outlet of the kidney into which urine is discharged before passing into the ureter. renal pelvis. bodily cavity, cavum, cavity - (anatomy) a natural hollow or sinus within the body.