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A 70-year-old woman presents with a one-week history of pruritus. She is normally well and does not take any regular medications. Her observations are within normal limits and she is afebrile. Blood results: Bili 70 AST 38 ALT 43 ALP 268 GGT 330 Amylase 92 Lipase 84 Creatinine 280

1. What single pathological process will most likely explain these blood results? 1 mark

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2. Based on these results, list three most likely aetiologies for these results in this patient. 3 marks

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3. List two advantages and two disadvantages for each of abdominal ultrasound and CT imaging specifically in this patient. 8 marks

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