Changes in the Portal Venous System

Recanalized Umbilical Vein Ultrasound

N In portal hypertension, the luminal size transverse diameter of the portal veins correlates poorly with the portal pressure. Thus, the diagnosis of portal hypertension relies not only on increased portal vein diameter but also on the results of CDS with spectral analysis and the assessment of flow characteristics. Definite signs of portal hypertension by CDS are flow reversal and an absence of flow. n The causes of raised portal venous pressure are classified as follows Prehepatic portal vein...

Ultrasound Scanning Planes

Kidney Ultrasound Scanning Planes

Fig. 15 Schematic representation of typical reverberations R occurring between strongly reflective interfaces I . T transducer Fig. 16 Reverberations Longitudinal scan of the uterus and bladder B with __ superimposed parallel lines caused by 14 abdominal wall structures. Arrows IUD n Significance Reverberations are consistently present in cystic organs but may also occur in solid structures. They are always troublesome and rarely helpful. They can be eliminated by changing the direction of the...

Circumscribed Changes in the Renal Pelvis and Renal Sinus

Parapelvic Cysts Ultrasound

Table 49 Circumscribed changes in the renal pelvis or renal sinus Anechoic or hypoechoic Isoechoic or echogenic Parapelvic cyst solitary, multiple, p. 284 Hemorrhagic cyst p. 287 Sinus lipomatosis p. 284 Pyelocalyceal stone p. 288 Parenchymal bands, hypertrophic renal columns Foreign body drainage tube, p. 288 p. 284 Inflammatory tumor, liquefying tumor p. 287 Xanthogranulomatous pyelonephritis p. 287 Carcinoma of the renal pelvis p. 287 Renal cell carcinoma, metastasis p. 287 n Solitary...