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Nephrology & Renal Medicine

Complex Renal Cyst (Bosniak Class IV)

ICD-10 Code
N28.1_3

Cystic renal mass with thickened, irregular, enhancing walls and solid nodular components. Highly malignant (approx 90-100% chance of being Renal Cell Carcinoma).

Clinical Presentation & Protocol

Patient Usually Complains Of

Patient presents for evaluation of a Bosniak IV renal cyst identified on imaging. Mass exhibits thickened, irregular, enhancing walls with solid nodular components. Denies gross hematuria, flank pain, or constitutional symptoms. No history of VHL or hereditary renal cancer syndromes.

Clinical Examination Findings

Patient is alert and oriented. Vitals stable. Abdominal exam: No palpable masses or costovertebral angle (CVA) tenderness. No peripheral edema. Skin clear of stigmata of renal malignancy.

Treatment Protocol

Referral to Urologic Oncology for surgical consultation. Recommended management: Partial or radical nephrectomy given high malignancy risk (90-100%). Pre-operative staging CT/MRI of chest/abdomen/pelvis ordered.

Detailed clinical guide coming soon.