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Malignant B-cell lymphoma in renal cyst wall
Brett A Laven1, Marcelo A Orvieto, David E Rapp
1Section of Urology, Department of Surgery, University of Chicago Pritzker School of Medicine, Chicago, Illinois 60637, USA.
Urology
|September 8, 2004
Summary
Bosniak type II renal cysts, typically benign, can rarely present with malignancy. This case highlights a Bosniak type II renal cyst associated with malignant B-cell lymphoma, discovered during laparoscopic exploration.
Area of Science:
- Nephrology
- Oncology
- Urology
Background:
- Renal cysts are common in adults over 50.
- Bosniak classification categorizes cysts by malignancy risk (I/II benign, III/IV malignant).
- Optimal management for indeterminate Bosniak I/II lesions remains unclear.
Observation:
- Computed tomography and ultrasound improve diagnostic accuracy for renal masses.
- Some indeterminate renal masses still require invasive evaluation.
- A patient presented with a Bosniak type II renal cyst.
Findings:
- The Bosniak type II renal cyst was associated with malignant B-cell lymphoma.
- Malignancy was found within the cyst wall.
- Diagnosis was confirmed after laparoscopic renal exploration.
Implications:
- This case expands the differential diagnosis for Bosniak type II renal cysts.
- It underscores the need for vigilance in evaluating seemingly benign renal cysts.
- Further investigation may be warranted for select Bosniak type II lesions.