We describe an elderly male patient who presented with fever of unknown origin and refractory hyponatraemia. Following (18) fluorine-fluorodeoxyglucose positron emission tomography/computed tomography scan and core adrenal biopsy, the diagnosis of diffuse large B-cell non-Hodgkin lymphoma with pituitary and bilateral adrenal involvement was confirmed. After chemotherapy, his symptoms resolved, and all the lesions shrank significantly.
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