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Answers From questions on page 24
  1. Helen Williams
  1. Correspondence to Dr Helen Williams, Department of Radiology, Birmingham Children's Hospital, Steelhouse Lane, Birmingham B4 6NH, UK; helen.williams{at}

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Question 1

1. The correct answer is: (E) autosomal recessive polycystic disease. Both kidneys are markedly enlarged, the left measuring approximately 10.8 cm, and the right 11.2 cm which is the sort of size expected in an adolescent, and approximately twice the average renal length at 6 weeks of age. In addition, both kidneys are abnormally echogenic (bright on ultrasound) with loss of normal cortico-medullary differentiation and the impression of multiple tiny cysts within the parenchyma. Microscopically, this appearance is due to fusiform dilatations of …

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