ABSTRACT
Hypercalcemia is an abnormal calcium metabolism, which can be caused by many diseases. Hypercalcemia caused by sarcoidosis is unusual. Sarcoidosis is a systemic granulomatous disease, it is lack of specificity in initial manifestations and easy to be misdiagnosed. In this paper, we report a patient with hypercalcemia and mediastinal lymphadenectasis, which the first diagnosis was misdiagnosed as tumour. Finally, sarcoidosis was diagnosed by mediastinal lymph node biopsy, and the patient was subsequently treated with glucocorticoid. Prednisone treatment improved symptoms of sarcoidosis, normalised serum calcium and mediastinal lymph nodes were diminished. This case suggests that clinicians need to raise awareness of sarcoidosis to identify and diagnose it correctly.