Rieko Shuto

CT and MR imaging findings of xanthogranulomatous cholecystitis: correlation with pathologic findings

The aim of this study was to evaluate CT and MRI findings in xanthogranulomatous cholecystitis (XGC) and to correlate the imaging findings with various pathologic parameters. The study included 13 patients with histopathologically confirmed XGC. The CT (n=13) and MRI (n=5) obtained in these patients were evaluated retrospectively. On CT, low-attenuation areas in the wall of XGC correlated with foam and inflammatory cells or necrosis and/or abscess in XGC. Areas of iso- to slightly high signal intensity on T2-weighted images, showing slight enhancement at early phase and strong enhancement at last phase on dynamic study, corresponded with areas of abundant xanthogranulomas. Areas with very high signal intensity on T2-weighted images without enhancement corresponded with necrosis and/or abscesses. Luminal surface enhancement (LSE) of gallbladder wall represented preservation of the epithelial layer. The early-enhanced areas of the liver bed on dynamic CT and MR images corresponded with accumulation of inflammatory cells and abundant fibrosis. Our results indicate that CT and MRI findings correlate well with the histopathologic findings of XGC.

CT and MR imaging of desmoplastic fibroblastoma

Abstract. Desmoplastic fibroblastoma (collagenous fibroma) developing as a slowly enlarging lower abdominal mass is described. The lesion had inhomogeneous low signal intensity (SI) on T1-weighted images, and mixed SI as low SI within high SI on T2-weighted images. On post-contrast T1-weighted images, the mass showed inhomogeneous enhancement. Histologically, the areas showing low SI on both post-contrast T1- and T2-weighted images consisted of dense collagenous components and reduced cellularity compared with the areas showing high SI on them.

Endovascular aortic arch reconstruction using in situ stent-graft fenestration in the brachiocephalic artery.

A patient who had previously undergone retrosternal gastric tube reconstruction for esophageal cancer presented with an aortic arch aneurysm. The patient was treated with endovascular stent-graft placement without median sternotomy, followed by revascularization of the brachiocephalic trunk using percutaneous in situ graft fenestration. A 9-month follow-up examination revealed marked regression of the aneurysm with patency of the stent-graft, without any complications. This in situ fenestration technique may extend the limits of thoracic endovascular therapy for patients who are unsuitable for sternotomy or aortic side-clamping.

Double Coaxial Microcatheter Technique for Transarterial Aneurysm Sac Embolization of Type II Endoleaks after Endovascular Abdominal Aortic Repair

PURPOSE To evaluate the feasibility and efficacy of transarterial sac embolization with a mixture of N-butyl cyanoacrylate and ethiodized oil (Lipiodol; Guerbet Japan, Tokyo, Japan) (NBCA-LPD) for type II endoleaks after endovascular aortic repair (EVAR) using a double coaxial microcatheter technique. MATERIALS AND METHODS A retrospective review was performed of 20 consecutive cases of type II endoleaks treated by transarterial embolization using the technique from August 2010 to June 2013. The treatment indication was persistent type II endoleak over 6 months after EVAR associated with aneurysm expansion ≥ 5 mm in maximum diameter. A 1.9-F nontapered microcatheter was advanced to the aneurysmal sac through a 2.7-F microcatheter, which was coaxially introduced through a catheter. The endpoint of the procedure was intrasaccular filling with NBCA-LPD and occlusion of the feeder of the type II endoleak. The technical success rate was defined as success in transarterial intrasaccular approach followed by embolization of the intrasaccular channel and inflow arteries. Clinical success was defined as aneurysmal sac shrinkage or stabilization (freedom from sac expansion > 5 mm in maximum diameter). RESULTS Technical success was achieved in 18 of 20 cases. During a mean follow-up period of 18.5 months, complete sac occlusion was observed in 13 cases (65%). Clinical success was achieved in 16 cases (80%). No serious complications were observed. CONCLUSIONS The transarterial intrasaccular approach with a double coaxial microcatheter technique can be successfully performed in most cases, and transarterial aneurysm sac embolization using NBCA-LPD has been proven to be feasible.

“Squid-Capture” Modified In Situ Stent–Graft Fenestration Technique for Aortic Arch Aneurysm Repair

An 83-year-old female was found to have an fusiform aneurysm in the aortic arch. She was deemed to be a high surgical risk; therefore, endovascular stent–graft placement followed by revascularization of the brachiocephalic trunk using in situ stent–graft fenestration was considered. However, the safe application of fenestration was deemed difficult due to the tortuosity of the brachiocephalic artery. The patient was successfully treated with the aid of the “squid-capture” technique, which consists of deployment of the stent–graft in a snare wire loop that was advanced from the brachiocephalic artery and fenestration of the stent–graft with the support of the loop. A follow-up exam revealed complete sealing of the aneurysm without any complications. The squid-capture technique allows for the safe and secure puncture of the graft.

Malignant lymphoma with tumor thrombus in the portal venous system.

We report a case of malignant lymphoma presenting with tumor thrombus of the portal venous system. Computed tomography showed a mass in the portal vein and mesenteric lymphadenopathy. Filling defects in the dilated portal vein also were identified by angiography. This type of the lymphoma is extremely rare, but it should be considered in the differential diagnosis of portal vein thrombus.

Anatomical variations of peripancreatic veins and their intrapancreatic tributaries: multidetector-row CT scanning

BackgroundTo date the anatomy of the intrapancreatic and peripancreatic veins using multidetector-row CT (MDCT) was not assessed. The object of this study is to establish 3D CT anatomy of these veins.MethodsA total of 100 consecutive patients who underwent abdominal triple-phase CT using 16-detector MDCT were retrospectively reviewed. The anatomical variations of the peripancreatic and intrapancreatic veins were assessed.ResultsAmong the 100 cases, 42 cases (42%) had a single posterior superior pancreaticoduodenal vein crossing the ventral side of the common bile duct, while 30 cases (30%) had an uncinate vein running upward behind the medial side of the pancreatic. In the pancreatic head and body/tail area, there were many small veins that directly entered the superior mesenteric or splenic vein. In 59 cases (59%), the centro-inferior pancreatic vein ran transversely along the inferior surface of the pancreatic body and drained the anterior or inferior parts of the pancreatic body, mainly into the splenic vein.ConclusionMany variations exist in the running patterns of intrapancreatic veins as well as peripancreatic veins. Recognition of abnormalities of intrapancreatic veins on CT in the light of normal CT anatomy may contribute to the interpretation of pathological conditions of the pancreas.

A new method for protection from shower embolism during TEVAR on a shaggy aorta

The case of a patient with a thoracoabdominal aortic aneurysm accompanied by a shaggy aorta, in whom embolism was prevented by a graft used in debranching and placement of an extracorporeal shunt during thoracic endovascular aortic repair, called the “block and trap method”, is presented. Two-staged operations were performed using Y graft replacement, debranching bypass, and thoracic endovascular aortic repair during which a temporary shunt line with a blood filter was made involving the femoral artery and vein. The method of trapping emboli in a filter in an external shunt appears effective.