Histologic changes: The sections of gangrenous lung were examined with polarized light. Scattered throughout the entire blackened area, as well as in the nearby viable lung parenchyma, were these crystals (A). Note that they are especially prevalent in the wall of a large blood vessel (arrows). There was no inflammatory reaction to them even in the viable lung tissue. The high-power view (B) shows the typical rosette or sheaf-like structure of the crystals. Other crystals appear as plates. What are these crystals? Answer

A

B

Clinical summary Image 4

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Answer: Calcium oxalate crystals