Pseudoaneurysm is uncommon but a life threatening complication of chronic pancreatitis. Angiography has been the standard definitive imaging modality in the diagnosis of pseudoneurysm. However. over the past 5 years duplux US and Dynamic CT have been proven to be valuable. The authors report a case of gastroduodenal pseudoaneurysm in chronic pancreatitis. Which could be diagnosed by duplux US and Dynamic CT. Furtheromre this case proved to be a pseudocyst which converted into a pseudoaneurysm By vessel rupture.