Scanning electron microscopy of normal, neoplastic and inflamed human bladder

Area of Science:

• Urothelial biology
• Scanning Electron Microscopy
• Oncology

Background:

• The urothelium's surface topography can vary significantly between normal, inflamed, and neoplastic states.
• Distinguishing between bladder inflammation and neoplasia is crucial for accurate diagnosis and treatment.

Purpose of the Study:

• To compare the topographic fine structure of human bladder urothelium using SEM in normal, neoplastic, and inflamed conditions.
• To identify surface markers indicative of transitional cell carcinoma.

Main Methods:

• Scanning electron microscopy (SEM) was employed to examine urothelial tissue samples.
• Comparative analysis of surface cell morphology and arrangement was performed across patient groups.

Main Results:

• Normal urothelium exhibits regularly arranged superficial cells with ridged surfaces.
• Transitional cell carcinoma displays rounded surface cells covered with microvilli.
• SEM can differentiate between inflamed and neoplastic urothelium, though severe cystitis may show intermediate patterns.

Conclusions:

• Surface microvilli are a valuable malignant marker for transitional cell carcinoma.
• Light microscopy is essential to exclude severe cystitis before considering microvilli diagnostic for neoplasia.