Abstract
Among 10%-20% of general population have kidney cysts, achieving 60% of people older than 60 years of age. They are classified in simple and complex (with risk to become malignant) cysts, uni- or bilateral cysts, congenital or acquired. According to the findings from contrast of computed tomography (CT) and magnetic resonance imaging tests, Bosniak identify four categories of cyst. Categories I and II lesions encompass benign lesions; category III lesions have malignant potential and deeper study is required; in category IV 90% of lesions are malignant and surgical treatment is required. Complex cysts may undergo rupture, infection or hemorrhage, so treatment have to take into account each clinical situation. In complex cases, besides treatment follow-up, ultrasound- or CT-guided fine-needle or percutaneous needle aspirations are required.
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