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The urinary bladder is a muscular sac in the pelvis, just above and behind the pubic bone. When empty, the bladder is about the size and shape of a pear. Urine is made in the kidneys and travels down two tubes called ureters to the bladder. The bladder stores urine, allowing urination to be infrequent and controlled.
Leiomyosarcoma of the bladder is considered a rare but significant clinical etiology, and is associated with substantial morbidity and mortality if not treated early. There remains a paucity of literature regarding this highly aggressive tumor with less than 200 cases reported to date.