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Ulcerative Colitis

An inflammatory bowel disease in which the inner lining of the large intestine (colon or bowel) and rectum become inflamed.


An imaging technology using high-frequency sound waves to see structures within the human body. It is noninvasive, there is no radiation and the exam is painless.

Undefined (Undifferentiated) Connective Tissue Disorders

A condition with symptoms similar to systemic autoimmune disorders or connective tissue disease, but cannot be classified as a well-defined connective tissue disease.

Undescended Testes (Testicles; also Cryptorchidism)

A condition in which a baby boy’s testes do not descend properly to the scrotum.

Unicameral Bone Cysts

A unicameral bone cyst (UBC), also known as a simple bone cyst, is a fluid-filled cavity in the bone that typically occurs in the upper part of the arm or the upper part of the leg. Learn more.

Ureteral Duplication

A condition in which one kidney has two ureters, each one drains separately into the bladder.

Ureteral Stones

Also called ureteral calculi, usually forming in the bladder and made up of naturally occurring minerals that crystallize out of the urine.


A balloon-like malformation of the area where a ureter, the tube from the kidney, enters the bladder.

Ureteropelvic Junction (UPJ) Obstruction

A blockage occurring where the kidney’s urine collection system meets the ureter, the tube that carries urine to the bladder.

Urethral Prolapse

A condition in young girls wherein the end of the urethra protrudes outward from the urinary opening.

Urinary Biofeedback

Urinary Biofeedback is a technique Lurie Children's uses to teach children to identify and control the proper muscles when urinating.

Urinary Frequency & Urgency

Also called overactive bladder, frequency of urination more than the usual seven times per day, and difficulty in delaying using the toilet.