Acute lobar nephronia (ALN) refers to a renal mass caused by acute focal infection without liquefaction. The radiological findings in 12 patients with 13 episodes of ALN are described. A characteristic combination uroradiological is (a) relatively sonolucent which disrupts corticomedullary definition on ultrasonography; (b) solid-appearing other studies; and (c) positive gallium image the region mass, may be associated increased activity elsewhere same or opposite kidney. angiographic...

Renal allografts are subject to many vascular complications. Over a 2-year period, 334 duplex Doppler ultrasonographic (US) examinations were performed in 88 renal allograft recipients. Vascular occlusion on the basis of severe rejection was documented ten patients (11.4%) for sensitivity and specificity 100%. Seven patients, whom there clinical US evidence artery stenosis, underwent angiography. A significant stenosis confirmed treated by angioplasty four patients; one had an insignificant...

Duplex Doppler ultrasound (US) was used in 68 consecutive patients with focal liver lesions, including 12 hepatocellular carcinomas, one cholangiocarcinoma, 37 metastases, 15 hemangiomas, hemangioendothelioma, and two nodular hyperplasias. Of the six were diffusely hyperechoic, hypoechoic, single hyperechoic multifocal hyperechoic. All ten tumors shifts of 5 kHz or above proved to be carcinomas. The other carcinomas showed 3 kHz. In contrast, no hemangioma 0.7 kHz, gave detectable signal. 20...

Recent increases in the pressure output of diagnostic ultrasound scanners have led to an interest establishing thresholds for bioeffects many organs including lungs mammals. Damage may be mediated by inertial cavitation, yet there been no such direct observations vivo. To explore hypothesis cavitation-based from ultrasound, research has performed on damage rat exposed 4.0-MHz pulsed Doppler and color ultrasound. A 30-MHz active cavitation detection scheme complementing these studies provides...

Gray scale ultrasound imaging circumvents some of the limitations other diagnostic tools. The authors have extended this technique to investigation hepatobiliary disease. details their equipment are described and results in relation various parameters disease discussed. A major feature gray is enhanced signal-noise ratio, which allows low-level echoes be displayed.

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNuclear magnetic resonance and conformational studies on amylose model compounds in dimethyl sulfoxide solutionM. St.-Jacques, P. R. Sundararajan, K. J. Taylor, H. MarchessaultCite this: Am. Chem. Soc. 1976, 98, 15, 4386–4391Publication Date (Print):July 1, 1976Publication History Published online1 May 2002Published inissue 1 July 1976https://doi.org/10.1021/ja00431a007RIGHTS & PERMISSIONSArticle Views252Altmetric-Citations103LEARN ABOUT THESE...

Sixty-nine duplex sonographic studies were performed in 24 patients who had received renal allografts. After a prospective qualitative analysis of the Doppler waveforms, results correlated with biopsy material and each patient's clinical course. Increased pulsatility waveform intrarenal arterial flow constituted an abnormal study, indicating acute rejection. Overall sensitivity varied histologic form rejection, 60% for interstitial rejection or without vascular 82% specificity was 95% 96%,...

Abstract Eight cases of obstructive jaundice are described to illustrate how diagnostic ultrasonography may be used differentiate between intra‐ and extrahepatic jaundice, especially in patients with malignancy. Ultrasound can also provide accurate anatomical localization the tumor site reveal cause obstruction. The ultrasound results compared isotopic findings. Cold areas scintigram caused by dilatation biliary tree misinterpreted. ability solid cystic tumors produces more data than...

Gray scale ultrasound can define intrarenal structures which could not previously be visualized. The normal calyces and infundibula within the renal sinus evaluated for abnormalities. Parenchymal anatomy (cortex, medulla, arcuate vessels) of right kidney is best demonstrated with patient supine, using liver as a window; left appreciated coronal scans in lateral decubitus position. Criteria differential diagnosis "Type I" parenchymal changes, echo intensity cortex increased, II" there focal...

In an operator-blind design, we used echo-Doppler duplex system to examine superior mesenteric artery and portal vein hemodynamics on two consecutive mornings in 12 fasting cirrhotic patients matched controls, randomized a standardized 355 kcal mixed-liquid meal vs. water. Cross-sectional area mean velocity were recorded from the at 30 min intervals, 0 150 after ingestion. Flows calculated. Pulsatility index, index related vascular resistance, was obtained for artery. Baseline flows did not...

Endovaginal sonography and endovaginal color flow imaging were compared in 155 patients with clinical suspicion of ectopic pregnancy. Sixty-five (42%) had surgically confirmed pregnancies. Thirty-six the pregnancies diagnosed alone, criteria being an extrauterine sac or fetus (sensitivity, 54%). Sixty-two 95%) when was seen placental identified adnexal mass separate from ovary uterus. The diagnosis pregnancy excluded (specificity, 98%) by finding intrauterine gestation, nonvisualization...

• One hundred fifty patients with cholestatic jaundice were studied prospectively by grey-scale ultrasonography. All had a diagnosis established subsequent biopsy, autopsy, or surgery. Using the presence absence of dilated biliary tree as criterion, intrahepatic extrahepatic nature was correctly differentiated in 145 150 patients, an accuracy 97%. 64 identified. Five 86 remaining each whom gallstones, misdiagnosed. In eighty-two (54.7%), specific etiology diagnosed. Ultrasound is accurate...

Because earlier studies suggested that preterm infants with germinal matrix hemorrhage or intraventricular both (GMH/IVH) present within the first 12 postnatal hours are at greatest risk for development of high-grade and neurodevelopmental disability, we examined factors this insult among 229 neonates 600 to 1250 gm birth weight in a multicenter study. All had echoencephalography (ECHO) 11 serially next 20 days; factor data were collected prospectively. Forty-three GMH/IVH 5 (mean age ECHO...

Twenty patients, aged 4 months to 58 years, were evaluated for liver transplantation by duplex sonography, and 15 transplantations completed; 42 postoperative examinations performed. Sonographic findings correlated with seven preoperative five angiographic evaluations. Preoperative US included tumors, portal vein occlusion, varices, biliary obstruction, variant vascular anatomy. Postoperative hepatic artery occlusions (one cavernous transformation), stenosis, intrahepatic extrahepatic fluid...

To build a prognostic system for patients with carotid transient ischemic attack or minor stroke.Inception cohort study 2-year follow-up.Urban community teaching hospital.Eligible (n = 142), identified on ultrasound roster, had been hospitalized between 1984 and 1987 within 30 days of first stroke.Stroke death 2 years.Three factors were associated stroke death: age more than 65 years, diabetes, hypertension. Based regression coefficients, years was assigned 3 points; hypertension, points. An...

Gray-scale ultrasound results are evaluated in 182 women with 204 histologically proved gynecologic masses. Ultrasound provided information leading to the correct diagnosis 56% of cases, contributory data 23%, and nonspecific 14%. Errors occurred 6%. A specific histologic was possible selected patients simple ovarian cysts, cystadenomas, cystadenocarcinomas, dermoids, uterine fibroids, ectopic molar pregnancies, missed abortions, endometriosis. characteristic but nondiagnostic pattern...

Duplex ultrasonography (US), consisting of real-time and pulsed Doppler US, was used to identify a pseudoaneurysm in patient with recurrent bleeding chronic pancreatitis. The authors present case that illustrates the limitations US evaluating sonolucent masses pancreatitis need for using technique.