Huge brown tumor of the rib in an unlocatable hyperparathyroidism patient with “self-recovered” serum calcium and parathyroid hormone: A case report

Figure 1 Ultrasound of parathyroid revealed no abnormal changes in the region of parathyroids, nor in ^99mTc-methoxyisobutyl isonitrile imaging. A-B showed that there was no abnormality of parathyroid in ^99mTc-methoxyisobutyl isonitrile imaging, nor any other abnormal radioactivity concentrations.

Figure 2 The whole-body bone imaging of the patient. A: There was abnormal radioactivity concentrations at the position of the left 7-9^th ribs; B: The tracer extravasation was shown in the right arm.

Figure 3 Enhanced chest and abdominal computed tomography revealed the rib mass. A-D: Plain scan; E-H: Enhanced scan.

Figure 4 Gross pathology of the mass originating from the 9-10^th ribs.