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A 39-year-old man presented to the orthopaedic clinic with a 1-month history of sacrococcygeal pain. The patient denied experiencing any other constitutional symptoms and any other disorders, and no history of trauma or surgery during the past years. Clinical examination and laboratory investigations revealed no definite abnormality. CT of the hip showed multiple calcification foci in the bilateral acetabulums and femoral heads (figure 1). Single-photon emission CT …
Contributors SL wrote the first draft of the manuscript and submitted the manuscript. XZ, AS and ZH were in charge of the patient and collected the data. SL and YL did the follow-up of the patient, and YW and YL critically revised the manuscript. YW and YL contributed equally to this paper. All authors approved the final version.
Funding This study was funded by Peking Union Medical College Graduate Student Innovation Fund (grant no: project no 2018-1002-02-08) and the National Natural Science Foundation of China (http://dx.doi.org/10.13039/501100001809) (grant no: project no 81871746).
Competing interests None declared.
Patient consent for publication Obtained.
Provenance and peer review Not commissioned; externally peer reviewed.
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