Pathology Word Decoder

The most common type of bladder cancer. "Urothelium" is the lining layer of the bladder, and "carcinoma" means a cancer that starts in a lining like that. You may also see the older name "transitional cell carcinoma."

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A tumor shaped like a little frond or seaweed that grows out from the bladder wall on a narrow stalk into the open space of the bladder. Many bladder tumors grow this way. It describes the shape, not how serious it is.

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A stage label meaning the tumor is on the surface lining only and has not grown into the deeper layers. Ta tumors are the most surface-level stage.

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A stage label meaning the tumor has grown just under the surface lining, into the connective-tissue layer beneath it, but not into the bladder muscle. It is deeper than Ta but is still called non-muscle-invasive.

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A stage label meaning the tumor has grown into the bladder muscle. This is called "muscle-invasive," and it usually follows a different treatment path than surface tumors.

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A flat patch of high-grade cancer cells on the surface lining — not a lump you can see growing out. Because it is flat and can be hard to see, it is watched and treated carefully even though it is on the surface.

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Describes how the cells look under the microscope. Low-grade cells look fairly close to normal. These tumors tend to grow slowly and rarely spread, though they can come back and need watching.

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High-grade cells look more abnormal and disorganized under the microscope. These tumors are taken more seriously and watched more closely, because they are more likely to grow or spread than low-grade ones.

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The "muscularis propria" is the thick muscle layer of the bladder wall. When the report says muscle was present in the sample, it means the pathologist could check whether the tumor reached that muscle — an important question for staging. If muscle was not present, your doctor may recommend a repeat procedure to be sure.

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The "lamina propria" is the thin connective-tissue layer just under the surface lining, above the muscle. "Invasion" here means the tumor has grown into that layer — the finding that makes a tumor T1 rather than Ta.

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Means cancer cells were seen inside small lymph or blood channels in the sample. Doctors note it because it can be a sign a cancer is more likely to spread, and it may affect the plan.

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"Histology" is how the tissue looks under the microscope. A variant is an uncommon pattern mixed in with the usual type. Some variants behave more aggressively, so your care team pays close attention when one is reported.

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"Cytology" is a test where a urine sample is checked under the microscope for cancer cells. Positive means abnormal or cancer cells were found in the urine. It points your care team toward looking closely, even if a tumor is small or flat.

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The "margin" is the edge of the tissue that was removed. A positive margin means cancer cells reached that cut edge, which can suggest some cancer may remain. Your doctor decides what, if anything, to do about it.

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