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Pathology · Additional topics

Urothelial carcinoma of the bladder

Carcinoma urotheliale

Urothelial carcinoma (formerly transitional cell carcinoma) is the most frequent malignant neoplasm of the urinary tract, accounting for up to 90–95% of all bladder tumors. The disease most commonly manifests with macro- or microhematuria and requires a multidisciplinary approach, including endoscopy and CT urography, for accurate staging and treatment planning.

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Common localizationThe tumor predominantly affects the trigone and the posterolateral walls of the urinary bladder.
SymptomsThe primary clinical sign prompting patients to seek medical attention is hematuria.
Risk factor #1Smoking increases the relative risk of developing urothelial cancer by almost 3-fold.
Gold standardRigid cystoscopy with biopsy (TUR), performed in the operating room under general anesthesia.
3 min readFor medical studentsUpdated 10.10.2026
Material prepared by WhiteCoat Pro editorial team based on platform study guidesPending instructor review

Epidemiology and morphological forms

Urothelial carcinoma is the second most common malignancy of the genitourinary system, second only to prostate cancer. The peak incidence occurs at 70–80 years of age. The pathology is diagnosed 3 times more frequently in men, which is historically associated with higher smoking rates and occupational hazards.

Macroscopically, neoplasms can present as coarse villous, exophytic, plaque-like, or invasive. There are two main growth patterns:

  • Papillary carcinoma. Represents an exophytic tumor attached to the mucosa by a stalk. A distinctive feature of this form is that invasion beyond the basement membrane is not always observed.
  • Plaque-like carcinoma. Manifests as mucosal thickening without prominent papillary projections. Unlike the papillary form, it tends to undergo progressive anaplasia. It may present as carcinoma in situ, but is significantly more often invasive cancer.

Diagnostic imaging (CT and MRI)

The imaging modality of choice is CT urography (CT urography). The examination invariably includes non-contrast and nephrographic phases. A split-bolus protocol is used to optimize visualization, and iterative reconstruction algorithms are applied to reduce radiation dose.

Typical radiological signs:

  1. Presence of a nodular mass with avid contrast enhancement.
  2. The mass originates from the wall and protrudes into the bladder lumen.
  3. In approximately 5% of cases, areas of calcification are identified along the anterior or lateral surfaces of the tumor.

Diffusion-weighted MRI (DWI) is also used as an effective imaging biomarker.

Important: False-positive results should be kept in mind during diagnosis. Cancer can be mimicked by benign lesions (papillomas, leiomyomas) and focal wall changes caused by routine cystitis.

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Risk factors and carcinogenesis

Exposure to chemical carcinogens predisposes the entire urothelium to the development of multifocal tumors. In pathogenesis, this phenomenon is termed "field change of the urothelium" (field change of the urothelium).

Key risk factors (besides smoking):

  • Occupational carcinogens: Contact with aromatic amines (benzidine, β-naphthylamine) used in the rubber, coal, and dye industries. Such "amine tumors" have a latency period of up to 20 years with an average exposure duration of about 7 years.
  • Medications: Prolonged use of the analgesic phenacetin (withdrawn in the 1970s).
  • Aristolochic acid (Aristolochic acid): Found in certain plants, causes "Chinese herbs nephropathy," and is closely associated with Balkan endemic nephropathy.
  • Heredity: The risk is increased in patients with hereditary nonpolyposis colorectal cancer (Lynch syndrome / HNPCC), particularly under the age of 60.
How to memorize

To remember specific risk factors (other than smoking), use the "PAB" mnemonic: P — Profession (aromatic amines), A — Analgesics (phenacetin), B — Balkan nephropathy (aristolochic acid).

Class and exam questions

Why is rigid rather than flexible cystoscopy preferred when cancer is suspected?

Rigid cystoscopy (rigid cystoscopy) is performed in the operating room under anesthesia, allowing immediate adequate biopsy or transurethral resection of the tumor.

Does urothelial carcinoma occur outside the urinary bladder?

Yes, tumors can develop in the renal pelvis, calyces, and ureters (UTUC). However, upper tract urothelial carcinoma accounts for only 5–10% of all urothelial cancer cases.

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What else to study on this topic

  • Characteristics of the natural history of upper tract urothelial carcinoma (60% invasiveness vs. 15% for bladder cancer).
  • Comparison of oncological outcomes between laparoscopic and open radical nephroureterectomy.
  • Principles of CT urography optimization: split-bolus protocol and iterative reconstruction.
  • Association of Lynch syndrome (HNPCC) with the development of urothelial cancer.
  • Current European Association of Urology (EAU) guidelines on the management of upper tract urothelial carcinoma.

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