MRI of the female pelvis: a possible pitfall in the differentiation of haemorrhagic vs. fatty lesions using fat saturated sequences with inversion recovery

The use of fat-saturated techniques should be an integral part of the work-up of any T1-hyperintense structure in the female pelvis for tissue characterization and for differentiation of a fat-containing ovarian mature teratoma from a haemorrhagic lesion. Two cases with haematocolpos and haematometra are presented, respectively. The haemorrhagic content showed high signal both on T1- and T2-weighted images, whereas an unexpected signal decrease in the fat-saturated T2-weighted inversion-recovery sequence was encountered. This unspecific suppression of signal in tissues with similar T1 relaxation times as fat can lead to a diagnostic pitfall both in T1- and T2-weighted STIR pulse sequences. Furthermore, a loss of signal on T2-weighting may also be due to the phenomenon of "T2-shading" in T1-bright ovarian endometrioma. Therefore, the fat-specific spectral fat-saturation of T1-weighted images is strongly recommended for tissue characterization in gynaecological disease.     

Prospective study of surgery for left ventricular aneurysm

To assess the effects of surgery for ventricular aneurysm on left ventricular performance 18 consecutive patients referred for such surgery were Studied prospectively. The patients had the following preoperative findings: ejection fraction by Isotope ventriculogram 28± 4 percent (mean ± standard error), New York Heart Association functional class 3.6 ± 0.1 and left ventricular noncontractile area 28 ± 3 percent by the graphic integration method. Thirteen patients had both angina pectoris and congestive heart failure, two had angina alone and three had congestive heart failure alone. All patients were studied before and after operation with isotope ventriculograms at rest and during exercise and treadmill exercise tolerance tests if their clinical status permitted these studies. Five patients also had postoperative cardiac catheterization. Catheterization data were in close agreement with the results of imaging studies. In 11 patients the aneurysm was resected and in 4 H was plicated; in 3, no discrete aneurysm was found. Sixteen patients including the three with no discrete aneurysm had concomitant coronary bypass grafting. There was no operative death and one late death.After operation, all patients had significant improvement in functional class (postoperative class 2.3 ± 0.1, p < 0.005). The amount of tissue resected (percent of total left ventricular surface area) was about 50 percent of the noncontractile area visualized on contrast angiography and there was a poor correlation between these two values (r = 0.56). Only four patients (22 percent) had either an increase in ejection fraction (range 8 to 13 percent) or a greater than 10 percent reduction in end-diastolic volume. Postoperative left ventricular end-diastolic pressure was unchanged. Thus, surgery for ventricular aneurysm can be accomplished with relatively small risk. Although functional Improvement is very common, it is not related to substantial improvement in global left ventricular function.     

Blood pressure measurements in patients with Takayasu arteritis: a work of caution

Takayasu arteritis is a large vessel vasculitis among young women that affects the aorta and its branches. Disease-related subclavian or brachial obstructions can lead to hypotensive brachial blood pressure values. By contrast, arterial hypertension is also frequent in this disease, possibly unrecognized in case of solitary brachial blood pressure measurement. We present the case of a 28-year-old woman with cerebral hypoperfusion related to Takayasu arteritis. Despite "pseudo-hypotensive" brachial blood pressure values of 70 mm Hg, Doppler measurement of the ankle revealed a systolic pressure of 220 mm Hg. In Takayasu vasculitis, additional ankle pressure measurement may represent the true cardiac load and blood pressure.     

Effect of decreased retinal illumination on simultaneously recorded pattern electroretinograms and visual-evoked potentials

Sixteen normal subjects and three patients with optic neuritis were studied to determine the effect of decreased retinal illumination on simultaneously recorded pattern electroretinograms (PERG) and visual-evoked potentials (VEP). Using neutral-density filters (NDF), it was found that linear modeling is an excellent fit for VEP/PERG amplitudes and latencies as log functions of retinal illumination, both for individual eyes and averages of pooled data. Within narrow statistical limits, regression slopes show that mean PERG B-wave and VEP P100 latencies are affected almost identically by decreased illumination, leaving the mean retinocortical time (RCT) virtually unchanged. However, mean B-wave amplitude was greatly reduced at retinal illuminations at which P100 amplitude was unaffected. Of clinical significance was that these latency and amplitude effects were found in each eye tested, whether normal or pathologic. In particular, the RCT in normal subjects was never found to be statistically abnormal due to decreased retinal illumination, and it faithfully represented the optic nerve lesion in the patients with optic neuritis. This result was applied to a population of eight patients with uncomplicated cataracts. The significance of these results is discussed.     

Delay from Diagnosis to Surgery in Transferred Type A Aortic Dissection

Objectives

The purpose of this research is to analyze factors associated with delays to surgical management of Type A acute aortic dissection patients.