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Urinary cytopathology in primary bladder amyloidosis
1Department of Pathology, The Johns Hopkins Hospital, Baltimore, Md. 21287, USA.
Acta Cytologica
|May 3, 2013
Summary
Diagnosing bladder amyloidosis is challenging as urinary amyloid is rarely detected. Early systemic amyloidosis testing is crucial for favorable outcomes in localized cases.
Area of Science:
- Uropathology
- Nephrology
- Oncology
Background:
- Amyloidosis involves extracellular protein accumulation resistant to lysosomal degradation.
- Isolated bladder amyloidosis is rare, with no prior cytopathologic description in voided urine.
Observation:
- A retrospective review identified 3 patients with isolated bladder amyloidosis and urine specimens.
- Patients aged 76-84; amyloidosis was not clinically suspected in any case.
- Urinary amyloid was mistaken for debris in one patient; two had no systemic signs, one had monoclonal gammopathy.
Findings:
- Diagnosing urinary amyloidosis is difficult without clinical suspicion.
- Spontaneous shedding of cohesive bladder amyloid protein into urine is uncommon.
- Systemic amyloidosis testing is recommended for bladder amyloidosis patients.
Implications:
- This study highlights the diagnostic challenges of urinary amyloidosis.
- Prompt testing for systemic amyloidosis can lead to favorable outcomes if the disease is localized.
- Further research into the cytopathology of voided urine in bladder amyloidosis is warranted.
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