LAUSR

FIGURE 1. Endoscopic ultrasound elastography images of a patient with AIP before (A) and after steroid treatment for 2 weeks (B). A, Three elastic images of the pancreas prior to treatment automatically selected by the ultrasound system, showing a homogenous, predominantly blue pattern with a median SR value of 9.15. B, Elastic images after steroid treatment for 2 weeks showing a heterogeneous, predominantly green patternwith amedian SR value of 3.39. A utoimmune pancreatitis (AIP) is a peculiar type of chronic pancreatitis typically showing a diffusely enlarged pancreas with a dramatic response to steroids. However, some patients present with atypical imaging that requires differentiation from pancreatic cancer. In such cases, a 2-week steroid trial may be helpful in confirming the diagnosis. However, it is not always easy to evaluate the treatment effect in a short period. The purpose of this study was to evaluate the usefulness of endoscopic ultrasound elastography (EUS-EG) combined with strain ratio (SR) in the estimation of short-term treatment effects in patients with AIP.