In xanthogranulomatous pyelonephritis

Question Number 1229

In xanthogranulomatous pyelonephritis

a) a retrograde contrast examination is contraindicated
b) the usual infective agent is staphylococcus aureus
c) radiological differentiation from renal cell carcinoma is usually difficult
d) there increased cortico-medullary differentiation on ultrasound
e) histologically there is characteristic depostion of amyloid in the renal parenchyma

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