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. 2021 May 28;31(12):9436–9445. doi: 10.1007/s00330-021-08062-x

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© The Author(s) 2021

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Fig. 2 — Spatially matched axial images (a: CT; b: DESS image at 3-T MRI; c: DESS image at 7-T MRI) of a 52-year-old man at the level of the posterior part of the medial femoral condyle of the right knee. Arrows highlight a clearly visible CaC deposit in the cartilage, seen as a point-shaped hyperdensity in CT (a) and as a point-shaped hypointensity in 7-T MRI (c) without a corresponding chondral signal change in the cartilage at 3-T MRI (b) (circle). CaC = calcium crystals, DESS = dual-echo steady state