This rhomboid shaped crystal of calciumpyrophosphate, which appears bluish-white (weak positive birefringence) by polarized light with red plate.
焦磷酸钙菱形结晶在红感光板偏振光下呈蓝白色(弱正双折射)。
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Calciumpyrophosphate dihydrate crystal deposition can occur in spinal structures such as intervertebral discs ligaments articular cartilage synovium and joint capsules16.