Aneurysms and pseudoaneurysms of the superior mesenteric artery are potentially lethal and should be treated as urgently as possible.In a 52-year-old man with occasional epigastric pain,we accidentally discovered a su...Aneurysms and pseudoaneurysms of the superior mesenteric artery are potentially lethal and should be treated as urgently as possible.In a 52-year-old man with occasional epigastric pain,we accidentally discovered a superior mesenteric artery aneurysm that was ruptured with spontaneous tamponade in the uncinate process and in the head of the pancreas.The ruptured aneurysm had a heterogeneous appearance due to its thrombotic and hemorrhagic content,and it simulated a voluminous mass in the head and uncinate process of the pancreas,associated with mild dilatation of the main pancreatic duct.Recent advances in multidetector computed tomography and magnetic resonance imaging have enabled radiologists to develop a correct diagnosis of mesenteric aneurysms and pseudoaneurysms of the visceral branches of the abdominal aorta,and to differentiate this diagnosis from that of pancreatic or peripancreatic masses;angiography is currently used to confirm a diagnosis and to develop therapeutic treatments.展开更多
AIM:To explore the physiopathology and magnetic resonance imaging(MRI)findings in an animal model of acute arterial mesenteric ischemia(AAMI)with and without reperfusion.METHODS:In this study,8 adult Sprague-Dawley ra...AIM:To explore the physiopathology and magnetic resonance imaging(MRI)findings in an animal model of acute arterial mesenteric ischemia(AAMI)with and without reperfusion.METHODS:In this study,8 adult Sprague-Dawley rats underwent superior mesenteric artery(SMA)ligation and were then randomly divided in two groups of 4.In groupⅠ,the ischemia was maintained for 8 h.In groupⅡ,1-h after SMA occlusion,the ligation was removed by cutting the thread fixed on the back of the animal,and reperfusion was monitored for 8 h.MRI was performed using a 7-T system.RESULTS:We found that,in the case of AAMI without reperfusion,spastic reflex ileus,hypotonic reflex ileus,free abdominal fluid and bowel wall thinning are present from the second hour,and bowel wall hyperintensity in T2-W sequences are present from the fourth hour.The reperfusion model shows the presence of early bowel wall hyperintensity in T2-W sequences after 1 h and bowel wall thickening from the second hour.CONCLUSION:Our study has shown that MRI can assess pathological changes that occur in the small bowel and distinguish between the presence and absence of reperfusion after induced acute arterial ischemia.展开更多
文摘Aneurysms and pseudoaneurysms of the superior mesenteric artery are potentially lethal and should be treated as urgently as possible.In a 52-year-old man with occasional epigastric pain,we accidentally discovered a superior mesenteric artery aneurysm that was ruptured with spontaneous tamponade in the uncinate process and in the head of the pancreas.The ruptured aneurysm had a heterogeneous appearance due to its thrombotic and hemorrhagic content,and it simulated a voluminous mass in the head and uncinate process of the pancreas,associated with mild dilatation of the main pancreatic duct.Recent advances in multidetector computed tomography and magnetic resonance imaging have enabled radiologists to develop a correct diagnosis of mesenteric aneurysms and pseudoaneurysms of the visceral branches of the abdominal aorta,and to differentiate this diagnosis from that of pancreatic or peripancreatic masses;angiography is currently used to confirm a diagnosis and to develop therapeutic treatments.
文摘AIM:To explore the physiopathology and magnetic resonance imaging(MRI)findings in an animal model of acute arterial mesenteric ischemia(AAMI)with and without reperfusion.METHODS:In this study,8 adult Sprague-Dawley rats underwent superior mesenteric artery(SMA)ligation and were then randomly divided in two groups of 4.In groupⅠ,the ischemia was maintained for 8 h.In groupⅡ,1-h after SMA occlusion,the ligation was removed by cutting the thread fixed on the back of the animal,and reperfusion was monitored for 8 h.MRI was performed using a 7-T system.RESULTS:We found that,in the case of AAMI without reperfusion,spastic reflex ileus,hypotonic reflex ileus,free abdominal fluid and bowel wall thinning are present from the second hour,and bowel wall hyperintensity in T2-W sequences are present from the fourth hour.The reperfusion model shows the presence of early bowel wall hyperintensity in T2-W sequences after 1 h and bowel wall thickening from the second hour.CONCLUSION:Our study has shown that MRI can assess pathological changes that occur in the small bowel and distinguish between the presence and absence of reperfusion after induced acute arterial ischemia.
