No abstract available.
Magnetic Resonance Angiography ; Perfusion

We report the imaging features of four cases with calcified intracranial aneurysm. All four patients underwentCT, CT angiography, MR, magnetic resonance angiography, and angiography. Calcification of the aneurysm wall was clearly demonstrated with CT and CTA in all cases and with conventional angiography in one case. The shape of calcification was curvilinear in two cases and punctate in two. On MR, two curvilinear calcifications were demonstrated as peripheral rim of signal void but two punctate calcifications were not shown.
Aneurysm* ; Angiography ; Cerebral Angiography ; Humans ; Intracranial Aneurysm ; Magnetic Resonance Angiography

PURPOSE: The purpose of this study was to assess the relative diagnostic capability of magnetic resonance angiography(MRA) and CT angiography(CTA) in the evaluation of intracranial aneurysm. MATERIALS AND METHODS: MRA and CTA were performed in 14 intracranial aneurysms (Including four which were ruptured) confirmed in the II patients involved by conventional angiography(CA). The size(in largest dimension) of the aneurysms ranged between 3 mm and 20 mm and the mean was 10.5 mm. For MRA, the 3D TOF method, with magnetization transfer suppression, wasused at 1.5T. For CTA, twenty seconds after beginning the injection of contrast media(100mL with use of a power injector at the rate of 3 mL/sec), CT scanning(30-second exposure and 60-mm length) was performed with a table speed of 2 mm/sec and a section thickness of 2mm. The resulting data were reformatted by MIP. MRA and CTA were compared with regard to the detection of aneurysms and their neck, size, shape, direction, intensity and relationship to adjacent bony structures or vessels. RESULTS: All aneurysms were clearly visualized with CTA. Inone case with a 3-mm aneurysm, however, this was not defined on MRA. Of the 13 aneurysms demonstrated by both MRA and CTA, eight were seen equally well with both modalities. CTA was considered to be superior to MRA in fivecases, either because calcification in the aneurysm wall was seen only on CTA(n = 3) or because the relationship with adjacent bony structures were seen better with CTA(n = 2). With CTA, the intensities of the aneurysm were homogeneous in all cases ; with MRA, however, the intensities of three large aneurysms were different. CONCLUSION: MRA and CTA may be useful in the evaluation of intracranial aneurysm, CTA has specific advantages over MRA inthe evaluation of large aneurysms, calcification of aneurysm wall and relationship with adjacent bony structure.
Aneurysm ; Angiography* ; Cerebral Angiography ; Intracranial Aneurysm* ; Magnetic Resonance Angiography* ; Neck

Unilateral or, particularly, bilateral congenital agenesis of the internal carotid artery is a rare anomaly. We report an occurrence of the condition, arising bilaterally, and report the findings of magnetic resonance imaging and magnetic resonance angiography.
Carotid Artery, Internal* ; Magnetic Resonance Angiography ; Magnetic Resonance Imaging

OBJECTIVE: Developmental venous anomalies (DVAs) are benign anatomic variations; therefore, they are usually discovered incidentally. The aim of this article was to describe radiological findings of DVAs. METHODS: A retrospective search for DVAs of the brain was performed in 1899 patients who had undergone magnetic resonance imaging (MRI) with contrast enhancement between January 1, 2005 and April 25, 2011. We also reviewed the results of computed tomography (CT), magnetic resonance angiography (MRA), CT angiography, and transfemoral cerebral angiography (TFCA) studies performed in patients with DVAs. RESULTS: Thirty-two DVAs were identified in 31 of the 1899 patients (1.63%). These 31 patients underwent five enhanced CTs, three MRAs, two CT angiographies, and two TFCAs. Thirty of the 32 DVAs were supratentorial (ST) and two were infratentorial (IT). All enhanced MRI studies exhibited excellent resolution of DVAs. All DVAs had only one draining vein. The venous drainage system was an IT vein in three DVAs and an ST vein in 29 DVAs. Two out of five enhanced CTs presented good visualization of the draining vein. None of the MRAs, including the source image, revealed the presence of DVAs. The two CT angiographies exhibited good resolution of DVAs. One of the two TFCAs yielded an excellent illustration of the DVA. CONCLUSION: CT angiography and MRI with contrast enhancement yielded detailed findings of DVAs. In contrast, MRA did not identify the DVAs. Enhanced CT presented only the draining vein of DVAs.
Angiography ; Brain ; Cerebral Angiography ; Drainage ; Humans ; Magnetic Resonance Angiography ; Magnetic Resonance Imaging ; Retrospective Studies ; Veins

No abstract available.
Arteries* ; Choroid* ; Magnetic Resonance Angiography* ; Vasculitis*

Angiomyolipoma arising from the liver is a rare primary benign lipomatous tumor of the lever. We experienced a case of surgically proven hepatic angiomyolipoma, which was preoperatively diagnosed by definning of its characteristic histologic components and benign radiologic nature with various imaging modalities including ultrasound, dynamic computed tomography, angiography, and magnetic resonance imaging. It was the first reported case in the world that full radiologic evaluation was taken and internal vascular proliferation was defined by using dynamic bolus CT prior to angiography.
Angiography ; Angiomyolipoma* ; Liver* ; Magnetic Resonance Imaging ; Ultrasonography

Angiomyolipoma arising from the liver is a rare primary benign lipomatous tumor of the lever. We experienced a case of surgically proven hepatic angiomyolipoma, which was preoperatively diagnosed by definning of its characteristic histologic components and benign radiologic nature with various imaging modalities including ultrasound, dynamic computed tomography, angiography, and magnetic resonance imaging. It was the first reported case in the world that full radiologic evaluation was taken and internal vascular proliferation was defined by using dynamic bolus CT prior to angiography.
Angiography ; Angiomyolipoma* ; Liver* ; Magnetic Resonance Imaging ; Ultrasonography

No abstract available.
Imaging, Three-Dimensional ; Magnetic Resonance Angiography*

PURPOSE: In stereotactic radiosurgery, awareness of the precise localization and volumetry of tumors and of critical organs, and the planning of the treatment field are important. The purpose of this study was to determine the degree of distortion in images obtained by digital subtraction angiography(DSA) and to assess whether DSA is a suitable may substitute for MRI in the planning of stereotactic radiosurgery. MATERIALS AND METHODS: After designing DSA phantoms we obtained images under variable conditions and analyzed image distortion using an image analysis program. RESULT: DSA imaging distortion increased as intensifying tube size became greater and the distance between tube and object decreased. CONCLUSION: Images obtained by DSA imaging were very distorted, and in the planning of stereotactic radio-surgery DSA is not, therefore, a suitable substitute for MRI.
Angiography, Digital Subtraction ; Magnetic Resonance Imaging ; Radiosurgery