Renal pelviceal keratinizing squamous metaplasia with sparing of pyramidal zones.

Metaplastic changes in the urothelium of the upper urinary tract are relatively infrequent. Metaplasia may present as either squamous or less often glandular differentiation. The process may be associated with chronic inflammation or associated chronic infections.

The overactive bladder in multiple sclerosis.

Multiple sclerosis is a common neurologic disorder that often affects the genitourinary system. One of the most common symptoms of multiple sclerosis is the hyperactive bladder. These patients will have symptoms that may affect their lifestyle, such as urinary incontinence, urgency, and frequency.