Pitfalls in Urinary Tract Cytopathology

Area of Science:

• Cytopathology
• Urology
• Oncology

Background:

• Urine cytopathology is a valuable tool for diagnosing and monitoring high-grade urothelial carcinoma (UC).
• Benign, reactive, and metaplastic changes in urine samples can mimic UC, presenting diagnostic challenges.

Purpose of the Study:

• To review common pitfalls in urine cytopathology that mimic urothelial carcinoma.
• To enhance diagnostic accuracy by understanding these mimics, referencing The Paris System (TPS).

Main Methods:

• Comprehensive literature review.
• Focus on common pitfalls based on The Paris System (TPS) for urinary tract cytopathology.
• Analysis of mimics including urothelial tissue fragments, degenerative changes, treatment effects, viral cytopathic changes, and metaplastic changes.

Main Results:

• Identified common pitfalls in urine cytopathology that can be mistaken for urothelial carcinoma.
• Detailed specific mimics such as urothelial tissue fragments, degenerative changes, treatment effects, viral cytopathic changes, and metaplastic changes.

Conclusions:

• Recognizing benign, reactive, or metaplastic lesions that mimic UC is crucial for accurate diagnosis.
• Awareness of these cytological changes is essential for cytopathologists to avoid diagnostic errors in urine cytology.