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A 40-year-old female patient (BMI = 29.8) with suspected renal calculi. a Axial low-dose (0.45-mSv) 2-mm non-contrast CT image reconstructed with 70 % ASiR and b axial conventional dose (7 mSv) 2-mm non-contrast CT image reconstructed with 40 % ASiR showing a 3.2-cm low-density left adrenal mass consistent with a benign adenoma (arrow). This left adrenal mass was missed when viewed on the low-dose non-contrast CT images
