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Respiratory Variation of the Diameter of the Pancreatic Duct on Sonography

Ronald H. Wachsberg1

1 Department of Radiology, University Hospital, UMDNJ-New Jersey Medical School, 150 Bergen St., Rm. C-320, Newark, NJ 07103-2406.



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  		Fig. 1A. —36-year-old man with epigastric pain and normal serum amylase level. Transducer center frequency was 4 MHz. Transverse sonogram obtained at end-expiration shows pancreatic duct in body of gland. E = 0.8 mm.

 


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  		Fig. 1B. —36-year-old man with epigastric pain and normal serum amylase level. Transducer center frequency was 4 MHz. Transverse sonogram obtained at end-inspiration at same level as A shows that diameter of pancreatic duct increases by 1.1 mm (from 0.8 to 1.9 mm) at end-inspiration. Although diameter at end-inspiration is normal, 1.1-mm change might be misinterpreted as evidence of ductal obstruction if secretin had been administered and postsecretin measurement was obtained at end-inspiration. F = 1.9 mm.

 


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  		Fig. 2A. —45-year-old woman with dyspepsia that was subsequently attributed to gastritis. Transducer center frequency was 4 MHz. Transverse sonogram obtained at end-expiration shows pancreatic duct in body of gland. B = 1.6 mm.

 


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  		Fig. 2B. —45-year-old woman with dyspepsia that was subsequently attributed to gastritis. Transducer center frequency was 4 MHz. Transverse sonogram obtained at end-inspiration at same level as A shows that diameter of pancreatic duct increases by 2.2 mm (from 1.6 to 3.8 mm) so that it exceeds the 2.5-mm upper limit of normal at end-inspiration. A = 3.8 mm.

 

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