The bladder is located in the lower abdomen. It is a hollow organ
with flexible muscular walls. It stores urine until a person is ready
to urinate. Bladder cancer is a disease in which cancer cells grow in
Bladder cancer occurs when cells in the body, in this case
bladder cells, divide without control or order. Sometimes, cells divide
uncontrollably when new cells are not needed. A mass of tissue called a
growth or tumor can form. The term cancer refers to malignant tumors.
Malignant tumors can invade nearby tissue and spread to other parts of
Three main types of cancer affect the bladder. They are named for the type of cell that becomes cancerous:
- Transitional cell (urothelial) carcinoma
- Squamous cell carcinoma
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