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Bladder cancer is any of several types of malignancy arising from the epithelial lining (i.e. "the urothelium") of the urinary bladder. The bladder is rarely involved by non-epithelial cancers (such as lymphoma or sarcoma) but these are not properly included in the colloquial term "bladder cancer." It is a disease in which abnormal cells multiply without control in the bladder. The bladder is a hollow, muscular organ that stores urine; it is located in the pelvis. The most common type of bladder cancer recapitulates the normal histology of the urothelium and is known as transitional cell carcinoma.
This text uses material from Wikipedia and is available under the GNU Free Documentation License.
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