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Clinical and imaging presentations of the patient. (A) The presence of subcutaneous nodule on left hand ring-finger. (B) X-rays of bilateral hands showed subcutaneous calcification on the extremity of left-hand ring-finger (red arrow). (C) Subcutaneous nodule on left hand ring-finger disappeared after STS treatment. (D) X-rays of bilateral hands showed the disappearance of subcutaneous calcification on the extremity of left-hand ring-finger after STS treatment (yellow arrow).
