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Small cell carcinoma of urinary bladder.
P E Swanson1, R Brooks, H Pearse
1Department of Pathology, Oregon Health Sciences University, Portland.
Urology
|December 1, 1988
Summary
Urinary bladder carcinoma can exhibit neuroendocrine differentiation, similar to lung cancer. Recognizing these aggressive tumors is crucial for accurate prognosis and treatment planning.
Area of Science:
- Uropathology
- Oncology
- Electron Microscopy
Background:
- Urinary bladder carcinoma is a significant health concern.
- Neuroendocrine differentiation in bladder tumors is rare but recognized.
- Oat cell carcinoma is a high-grade neuroendocrine tumor typically found in the lung.
Observation:
- A case of urinary bladder carcinoma with extensive oat cell carcinoma-like features was observed.
- The patient presented with distant metastases and died seven months post-diagnosis.
- Electron microscopy revealed dense-core, membrane-bound granules, indicating neuroendocrine differentiation, though argyrophil cells were not demonstrated.
Findings:
- Malignant bladder neoplasms with neuroendocrine features can metastasize widely and grow rapidly, mirroring pulmonary counterparts.
- Ultrastructural evidence of neuroendocrine differentiation was found in 12 reviewed bladder neoplasms.
- These tumors possess the potential for widespread dissemination and rapid growth.
Implications:
- Neuroendocrine bladder tumors may be more common than previously thought.
- Accurate identification of these neoplasms is vital for determining patient prognosis.
- Recognition impacts the selection of appropriate therapeutic strategies for bladder cancer.