Imaging-Guided Biopsy for Renal Lesions
Introduction to Biopsy
- The American College of Radiology recommends imaging-guided biopsy for renal lesions extending from the kidney to the iliac bone, as it provides a definitive diagnosis and guides treatment decisions 1, 2
- A 22-year-old female patient presented with a 10-day history of right flank pain and fatigue, and was found to have a renal lesion extending to the iliac bone, with elevated CRP and creatinine levels 1
- Imaging studies, including non-contrast MRI and CT, revealed a renal lesion with hydronephrosis, but the nature of the lesion could not be determined 1, 2
Indications for Biopsy
- The American College of Radiology states that biopsy is indicated for indeterminate renal masses, particularly for diagnostic purposes and to guide treatment decisions 1, 2
- Biopsy results can be used to guide decision-making, aiming to minimize kidney function loss 1
- When imaging features are non-diagnostic, biopsy increases diagnostic accuracy 2
- For complex lesions extending from the kidney to the iliac bone, histological diagnosis is mandatory for treatment planning 1, 3
Biopsy Technique and Safety
- Major complications associated with biopsy are rare, with only 2 significant complications reported in a study of 235 biopsies (0.9%) 1
Evaluation of Other Treatment Options
- Initiating broad-spectrum antibiotics is not appropriate before diagnosis, as the nature of the lesion is unknown 1, 2
- Starting high-dose corticosteroids is contraindicated without a diagnosis and may worsen an infectious process 1
- Removing the entire lesion, including the kidney, without a histological diagnosis may result in overtreatment and unnecessary morbidity 1, 2
- MR-guided angiography is not a diagnostic tool, and histological diagnosis is required before treatment planning 1, 3