Challenges in the differential diagnosis of hypercalcemia: A case of hypercalcemia with normal PTH level

Figure 1 Corrected serum calcium and parathyroid hormone concentrations during hospitalization, before and after pamidronate administration. Continuous line, corrected serum calcium; dotted line, serum parathyroid hormone (10 pg/mL-75 pg/mL); gray band, normal reference range for serum calcium (8.5 mg/dL-10.5 mg/dL).

Figure 2 Histological sections of axillary lymph node (A and B) and bone marrow (C and D). Lymph node: A: Immunohistochemical stain for CD20; B: Immunohistochemical stain for Ki67; Bone marrow: C: Hematoxylin-eosin staining; D: Immunohistochemical stain for CD20.