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. 2022 Dec 1;11(1):1–11. doi: 10.1007/s40134-022-00405-w

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Fig. 14 — Chest X-ray shows a doubtful nodule in the right lung (arrow). DTS demonstrates that this opacity is due to a bony island of sclerosis in the costal arch (enostosis) (B). Enostosis is a typical imaging finding which can mimic a pulmonary opacity in the elderly