Urinary tract infection (UTI) facts. 1  Urinary tract infections (UTIs) are infections of the urethra, bladder, ureters, or the kidneys, which comprise the urinary tract.  E. coli bacteria cause the majority of UTIs, but many other bacteria, fungi, and parasites may also cause UTIs.
Common vasculitis skin lesions are: 1  red or purple dots (petechiae), usually most numerous on the legs. 2  larger spots, about the size of the end of a finger (purpura), some of which look like large bruises. 3  Less common vasculitis lesions are hives, an itchy lumpy rash and painful or tender lumps. Antibodies that react against cells in vessel walls. 2  In some cases of vasculitis, an antibody against the cytoplasm of neutrophils (anti-neutrophil cytoplasm antibodies, or ANCA) is the probable cause of the inflammation and damage.
The blood vessels are comprised of arteries that pass oxygen-rich blood to the tissues of the body and veins that return oxygen-depleted blood from the tissues to the lungs for oxygen. Vasculitis is characterized by inflammation in and damage to the walls of various blood vessels.Each of the vasculitis diseases is defined by certain patterns of distribution of blood vessel involvement, particular organ involvement, and laboratory test abnormalities.he word vasculitis is derived from the Latin vasculum, vessel + - itis, inflammation. Another term for vasculitis is angiitis. When arteries are the inflamed blood vessels, the condition is also referred to as arteritis. When the veins are inflamed, it is referred to as venulitis.