THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -The renal sinus is a fat-filled cavity in the middle of the kidney that cushions important parts. One of those parts is the renal pelvis, which collects urine as it’s produced by the kidney. The most common disorder associated with the renal sinus is a cyst, which often has no symptoms.

Detailed explanation-2: -The renal sinus is a central spacious cavity formed by the extension of the perinephric space into the deep recess located at the medial border of the kidney (, Figs 1, , 2). The renal sinus is surrounded by the kidney parenchyma laterally.

Detailed explanation-3: -The renal sinus is the most echogenic portion of the normal kidney. It includes the calyces, renal pelvis, renal vessels, fat, nerves, and lymphatic channels. A ureterocele is a cystlike enlargement of the lower end of the ureter.

Detailed explanation-4: -Each renal artery enters a kidney at a site called the renal hilum. This area is the entry and exit point for vessels and nerves that feed into the kidneys. From there, the artery branches into smaller blood vessels throughout the kidney.