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Hypercalcaemia AKI Malignancy — ESENeph MCQ

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ModerateAcute Kidney InjuryHypercalcaemia AKI MalignancyESENeph

A 45-year-old woman is found to have hypercalcaemia (corrected Ca 2.92 mmol/L), AKI (creatinine 250 umol/L), and a uACR of 85 mg/mmol. She has a palpable left breast mass. Serum PTH is low. PTHrP is elevated. What is the cause of her kidney injury?

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Correct answer: AMalignancy-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