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DDx. Complicated Cyst
Bosniak classification of renal cysts
The Bosniak cassification of renal cystic disease Category I: Malignant risk less than 1%; no follow-up required
Category II: Malignant risk less than 3%; no follow-up required; Cystic lesion with some abnormal radiological features
Category IIF: Malignant risk 5-10%; follow-up recommended; Cystic lesion with increased abnormal findings
Category III: Malignant risk 40~60%; surgical excision recommended More complicated
Category IV: Malignant risk greater than 80%; surgical excision recommended
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