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Oxygen inhalation led to subtle but readily detectable changes on T2*-weighted images with a conventional MR imager at 1.5 T. We attribute the increase in local signal intensity to changes in blood oxygenation, in particular to a net conversion of deoxyhemoglobin to oxyhemoglobin.
The spinal dorsal horn is known for its important functional role in the field of transmission and modulation of sensory afferents. Because of this, the dorsal horn represents a target for numerous analgesic and antispastic procedures. Thus, it would be interesting to develop imaging dedicated to this spinal structure. The purpose of this study was to… (More)
We present a case of aneurysm of the anterior communicating artery associated with a pituitary adenoma. Recognition of this association has important clinical implications, leading to modification of the surgical approach. The aneurysm was shown on MR angiography and confirmed with contrast arteriography and at surgery.
Calcific cerebral emboli (CE) are a rare complication of calcified aortic valve stenosis (CAS). These emboli usually result from diagnostic manoeuvres (e.g. left heart catheterization) or from therapeutic procedures (e.g. heart valve surgery). Spontaneous calcific emboli are exceptional. We present the cases of two subjects known to have CAS who presented… (More)
A 68-year-old man with a history of large cell lung carcinoma presented 1 year after surgical management of the initial lesion, with a complete unilateral IX-XII cranial nerve palsy with Horner's sign. This rare multiple cranial nerve palsy is called Villaret's syndrome. It suggests an extracranial lesion located in the retroparotid space. Complete basal… (More)
The purpose of this paper is to evaluate the efficacy and safety of CT-guided needle biopsies and to determine the optimal indications for this technique. The case histories of 118 patients who underwent a CT-guided biopsy for brain lesions during a six-year period, from November 1986 to September 1992, were reviewed. During a preliminary CT-scan, the entry… (More)
Five children (3 girls, 2 boys, aged from 1 to 18 years) presenting with Sturge-Weber syndrome were explored by MRI with contrast injection in 2 cases. The respective positions of CT and MRI are discussed: CT is the method of choice to display leptomeningeal calcifications. MRI seems to be more accurate than CT to determine the location of the lesions and… (More)
We report a case in which MRA made it possible to diagnose a dural arteriovenous fistula and thrombophlebitis in a 23-year old woman. 2D TOF MRA is the usual technique in the diagnosis of thrombophlebitis. Our experience shows the limits of 2D TOF since the increased signal intensity in the sinus could simulate a normal flow, and we describe the advantages… (More)
We present three cases of subclavian steal syndrome demonstrated by MR angiography. By using a presaturation pulse located at the bottom or at the top of the acquisition volume we demonstrated the flow direction of vertebral arteries. We used a new investigational two-dimensional time-of-flight sequence.