What are the Ultrasound findings of urinary obstruction? US is often the first imaging study of choice in patients with newly diagnosed renal dysfunction in order to exclude an underlying mechanical obstruction. Diagnosing urinary obstruction sonographically is based on the detection of hydronephrosis. Sonographically, the dilated renal collecting system appears as multiple anechoic structures conforming …
What is the Ultrasound appearance of renal calculi? Renal calculi are very common and one of the most common causes of urinary tract obstruction. Renal calculi are detected sonographically as echogenic foci with posterior acoustic shadowing. In addition, most urinary tract calculi demonstrate a twinkling artifact with color and power Doppler imaging, which is the …
Does Ultrasound have a role in evaluating pyelonephritis? Sonographic imaging of the kidneys is usually reserved for refractory rather than acute cases of pyelonephritis, in order to search for potential complications such as renal abscess formation. Most patients with acute pyelonephritis have normal-appearing kidneys on US. When present, sonographic features that can be seen with …
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What is the normal sonographic appearance of the kidney? The adult kidney usually measures 9 to 13 cm in length. The renal cortex is normally isoechoic to hypoechoic compared to the liver and hypoechoic compared to the spleen. Renal medullary pyramids are hypoechoic relative to the renal cortex. The renal sinus is predominantly composed of fat …
Can the two main cystic neoplasms of the pancreas be differentiated sonographically? Serous, or microcystic, cystadenoma is a multilocular cystic lesion comprised of cystic foci measuring from <1 mm up to 2 cm. There can be a central scar with or without calcification. The sonographic appearance can vary depending on the size of the cystic foci from …
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What are the sonographic features of pancreatic adenocarcinoma? Most commonly, pancreatic adenocarcinoma appears sonographically as an ill-defined, hypoechoic pancreatic mass. Dilation of the main pancreatic duct upstream to the mass is also commonly seen. When the mass is located in the pancreatic head, both the main pancreatic duct and the extrahepatic bile duct may be …
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Does Ultrasound have a role in evaluating acute pancreatitis? In the early and milder forms of pancreatitis, the pancreas may appear normal on US. Alternatively, the pancreas may be obscured by gas from a secondary adynamic ileus in the acute setting. Therefore, the primary role of US in acute pancreatitis is to determine whether or …
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