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[Virtual cystoscopy of bladder neoplasms. Preliminary experience]
G F Gualdi1, E Casciani, M Rojas
1I Clinica Medica, Università La Sapienza, Roma. Gualdi@uniRoma1.it
La Radiologia Medica
|September 9, 1999
Summary
Virtual cystoscopy effectively detects urinary bladder cancer masses larger than 1 cm, offering a less invasive alternative to conventional cystoscopy. While missing smaller lesions, it aids in specific patient cases, complementing traditional methods.
Area of Science:
- Urology
- Medical Imaging
- Oncology
Background:
- Conventional cystoscopy is a primary tool for diagnosing urinary bladder carcinoma.
- However, it is invasive, has a limited field of view, and is contraindicated in certain conditions like severe urethral strictures or active bleeding.
Purpose of the Study:
- To compare the diagnostic sensitivity of virtual cystoscopy with conventional cystoscopy for detecting urinary bladder cancer.
- To evaluate the utility of virtual cystoscopy as a complementary diagnostic tool.
Main Methods:
- Volumetric spiral CT of the urinary bladder was performed in 12 patients diagnosed with bladder cancer.
- Virtual cystoscopy images were generated from CT data and compared with conventional cystoscopy and pathological findings.
- Bladder distension was achieved using 180-200 mL of air.
Main Results:
- Virtual cystoscopy visualized 90% of masses detected by conventional cystoscopy.
- All masses greater than 1 cm (100%) were identified, while 71% of masses smaller than 1 cm were detected.
- Three 4-mm masses were missed by virtual cystoscopy.
Conclusions:
- Virtual cystoscopy demonstrates high sensitivity for detecting larger bladder cancer masses (>1 cm).
- It is a valuable tool for patients unable to undergo conventional cystoscopy and can complement conventional methods for specific anatomical areas and follow-up.
- Limitations include the inability to perform biopsies and reduced sensitivity for smaller lesions.