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Urinary bladder carcinoma with a neoplastic squamous component: a mapping study of 31 cases
N Sakamoto1, M Tsuneyoshi, M Enjoji
1Second Department of Pathology, Faculty of Medicine, Kyushu University, Fukuoka, Japan.
Histopathology
|August 1, 1992
Summary
Pure squamous cell carcinoma in the bladder may arise from squamous metaplasia or extensive differentiation within transitional cell carcinoma. This study explores the histogenesis of these bladder cancers.
Area of Science:
- Uropathology
- Oncology
- Surgical Pathology
Background:
- Pure squamous cell carcinoma (SCC) and transitional cell carcinoma (TCC) with squamous differentiation are bladder cancers.
- Understanding the histogenesis of pure SCC is crucial for diagnosis and treatment.
Purpose of the Study:
- To investigate the histogenesis of pure squamous cell carcinoma in cystectomy specimens.
- To differentiate between two proposed pathways of pure SCC development.
Main Methods:
- Mapping study of cystectomy specimens.
- Analysis of 3 pure SCC cases and 28 mixed TCC with squamous differentiation cases.
- Histopathological examination focusing on contiguous mucosal changes.
Main Results:
- Two of three pure SCC cases showed contiguous benign keratinizing and atypical squamous metaplastic mucosa, suggesting origin from metaplasia.
- Most TCC with squamous differentiation lacked these metaplastic changes.
- Seven cases of TCC with squamous differentiation showed predominant squamous components, suggesting origin from differentiation within TCC.
Conclusions:
- Pure squamous cell carcinoma may arise from malignant transformation of squamous metaplasia.
- Alternatively, pure SCC can develop from extensive squamous differentiation within a pre-existing transitional cell carcinoma.
- These findings suggest two distinct histogenetic pathways for pure bladder squamous cell carcinoma.