Category: Abdominal Imaging, Region: Abdomen-Pancreas, Plane: Other
Findings: Longitudinal gray-scale transabdominal ultrasonography image (A) of the pancreatic region shows an anechoic lesion with posterior acoustic shadowing (asterisk) measuring 5.3 x 5.7 cm. Note that measurements are made from outer to outer wall. Transverse color Doppler (B) sonogram demonstrated turbulent flow (red-blue) in the lesion. Thus, the structure should be vascular in its nature, and is shown with the characteristic “ying-yang” sign (big arrow) compatible with pseudoaneurysm of the splenic artery. Color and spectral Doppler image (C and D) taken at the site of the pseudoaneurysm shows bidirectional blood flow of arterial (C, arrow) and venous flow (D, arrowhead) consistent with to-and fro pattern. Technique: Transabdominal ultrasonography with a C5-1 curvilinear multifrequency transducer utilizing gray-scale, color doppler and spectral analysis. The curvilinear ultrasound transducer has a frequency range of 5.0 to 1.0MHz.