Lipiduria orlipuria is the presence oflipids in theurine. Lipiduria is most frequently observed innephrotic syndrome where it is passed aslipoproteins along with other proteins.[1][2] It has also been reported as a sign followingfat embolism.[3]
When lipiduria occurs, epithelial cells or macrophages contain endogenous fats. When filled with numerous fat droplets, such cells are called oval fat bodies. Oval fat bodies exhibit a "Maltese cross" configuration underpolarized light microscopy.[4] The Maltese cross appearance occurs because of its liquid-crystalline structure giving it a double refraction (birefringence).
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