D2I2.
metabolic

Pseudogout

Calcium pyrophosphate dihydrate (CPPD) crystal deposition disease, also known as pseudogout and pyrophosphate arthropathy, is a rheumatologic disease which is thought to be secondary to abnormal accumulation of calcium pyrophosphate dihydrate crystals within joint soft . The knee joint is most commonly affected. The disease is in origin and its treatment remains .

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Plain-language summary adapted from Wikipedia. Not medical advice.