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Long-term histopathological changes observed in rats subjected to augmentation cystoplasty
J S Little1, L W Klee, D M Hoover
1Department of Urology, Indiana University Medical Center, Indianapolis.
The Journal of Urology
|August 1, 1994
Summary
Augmentation cystoplasty using various gastrointestinal segments in rats can lead to proliferative lesions and tumors. These bladder tumors, while not invasive, showed some features of malignancy, warranting further investigation.
Area of Science:
- Urology
- Surgical Pathology
- Oncology
Background:
- Augmentation cystoplasty is a surgical procedure to enlarge the bladder.
- Concerns exist regarding the development of proliferative lesions after augmentation cystoplasty.
Purpose of the Study:
- To investigate long-term histopathological changes in rat bladders after augmentation cystoplasty.
- To assess the development of tumors following the use of different gastrointestinal segments for bladder augmentation.
Main Methods:
- Prepubescent female rats underwent gastrocystoplasty, ileocystoplasty, colocystoplasty, or sham operations.
- Bladders were examined histologically 14 to 27 months post-surgery.
Main Results:
- Metaplastic and/or hyperplastic changes were observed in all augmented bladders.
- Tumors developed in rats that underwent gastrocystoplasty (4/10), ileocystoplasty (3/11), and colocystoplasty (2/11).
- Some tumors exhibited histological features of malignancy, though none invaded surrounding tissues.
Conclusions:
- Augmentation cystoplasty using gastrointestinal segments is associated with proliferative lesions and tumor formation in rats.
- The findings highlight the potential for long-term adverse effects, including neoplastic changes, after bladder augmentation surgery.