Cholesterol crystal

Cholesterol crystals from the urinary sediment of a patient with cystic kidneys. Many fatty degenerated white blood cells are seen in the background. Cholesterol crystals formed cysts during the long-time inflammation, and when cysts broke, entered the urine. Unstained, X100.

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Same field as the preceding one, but seen by polarized microscopy. Cholesterol crystals show weak monotone polarization. Unstained, X100.