Hypercalcaemia AKI Malignancy — ESENeph MCQ
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Correct answer: A — Malignancy-associated hypercalcaemia causing renal vasoconstriction, dehydration, and nephrocalcinosis
This patient has humoral hypercalcaemia of malignancy (PTHrP-mediated) from suspected breast cancer. Severe hypercalcaemia causes AKI through renal vasoconstriction, volume depletion (through nephrogenic diabetes insipidus mechanism), and potential nephrocalcinosis. Low PTH with elevated PTHrP confirms the diagnosis. Management involves aggressive IV saline rehydration, IV bisphosphonate (Zoledronic acid), and treatment of the underlying malignancy.
Reference: NICE NG12 2015 – Suspected Cancer; KDIGO 2012 – AKI