Abstract
To prospectively assess the utility of transabdominal ultrasound in surveillance of known pancreatic cystic lesions (PCL) using same day MRI as reference standard. In an IRB-approved study with written informed consent, patients with known PCL underwent pancreas US on same day as surveillance MRI. US was performed blinded to same date MRI results. Transverse (TR), antero-posterior (AP), cranio-caudal (CC), and longest any plane diameter, were measured for each PCL at US and MRI. Visualization was correlated with patient (weight, abdominal diameter, thickness of abdominal fat, sex) and cyst (location, size, internal complexity) factors. 252 PCLs evaluated in 57 subjects (39 females; mean age 67 (range 39-86) yrs). Mean maximum PCL diameter 8.5 (range 2-92)mm. US identified 100% (5/5) of cysts ≥3cm; 92% (12/13) ≥2 and <3cm; 78% (43/55) ≥1 and <2cm; 35% (27/78) ≥5mm and <1cm; and 16% (16/101) <5mm. US visualization correlated with PCL location (<0.0001), size (p<0.0001), patient gender (p=0.005), participation of attending radiologist (p=0.03); inversely with patient weight (p=0.012) and AP abdominal diameter (p=0.01). Many PCLs are visualized and accurately measured at follow-up with transabdominal ultrasound. Visualization correlates with lesion size, location, patient sex, weight, and abdominal diameter.
Published Version
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