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The kidney is divided into parenchyma and renal sinus. The renal sinus is hyperechoic and is composed of calyces, the renal pelvis, fat and the major intrarenal vessels. In the normal kidney, the urinary collecting system in the renal sinus is not visible, but it creates a heteroechoic appearance with the interposed fat and vessels.
Upon presentation of decreased renal function, it is recommended to perform a history and physical examination, as well as performing a renal ultrasound and a urinalysis. [ citation needed ] The most relevant items in the history are medications , edema , nocturia , gross hematuria , family history of kidney disease, diabetes and polyuria .
Bounded by the posterior leaf of the renal fascia and the muscles of the posterior abdominal wall. It contains only fat ("pararenal fat" also known as "pararenal fat body", "paranephric body", or "paranephric fat"). Pararenal fat is a fatty layer situated posterior to the renal compartment, and extending inferiorly into the iliac fossa. [7]
Abdominal ultrasound can be used to diagnose abnormalities in various internal organs, such as the kidneys, [1] liver, gallbladder, pancreas, spleen and abdominal aorta.If Doppler ultrasonography is added, the blood flow inside blood vessels can be evaluated as well (for example, to look for renal artery stenosis).
The kidney is surrounded by tough fibrous tissue, the renal capsule, which is itself surrounded by perirenal fat, renal fascia, and pararenal fat. The anterior (front) surface of these tissues is the peritoneum, while the posterior (rear) surface is the transversalis fascia. The superior pole of the right kidney is adjacent to the liver.
Pericardial fat pad sign; Perkin's line; Phantom calyx sign; Picket fence appearance; Picture frame sign; Pie-in-the-sky sign; Piece of Pie sign; Playboy sign; Pneumatosis intestinalis; Pneumoarthrogram sign; Polka dot sign; Popcorn appearance; Popcorn calcification; Pseudo Rigler's sign; Pseudofracture; Puckered panniculus sign; Pulmonary ...
When filled with numerous fat droplets, such cells are called oval fat bodies. Oval fat bodies exhibit a " Maltese cross " configuration under polarized light microscopy . [ 4 ] The Maltese cross appearance occurs because of its liquid-crystalline structure giving it a double refraction ( birefringence ).
Ultrasound is standard and is particularly sensitive to the fat in angiomyolipomas, but less so to the solid components. However, accurate measurements are hard to make with ultrasound, particularly if the angiomyolipoma is near the surface of the kidney (grade III). [4] CT is very detailed and fast, and allows accurate measurement.