[Contrast-enhanced ultrasound manifestations of IgG4 related autoimmune pancreatitis].

To analyze and summarize the contrast-enhanced ultrasound (CEUS) characteristics in patients with IgG4 related autoimmune pancreatitis (IgG4-AIP). A total of 54 patients (aged 26 to 76 years old) with IgG4-AIP were collected and retrospectively analyzed. The results demonstrated that there is a variety of enhanced performance on CEUS in patients with IgG4-AIP in the early stage, for some them, especially for those with mass-type pancreatitis, their sonographic appearance and the CEUS characteristics are similar when compared with the patients with pancreatic carcinoma, with varying degrees of low enhancement in the arterial phase, venous phase and delayed stage. Therefore, it is not advisable to make a differential diagnosis based on CEUS alone, and comprehensive evaluation is warranted.