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+A 9-year-old girl was admitted to the paediatric department from the emergency department for the second episode of macroscopic haematuria in 20 days.
+No family history of interest, personal history of facial haemihypertrophy due to congenital torticollis, chickenpox, infectious mononucleosis, nocturnal enuresis until the age of 7, pneumonia at 9 months and trauma to the coccyx.
+Physical examination: slight skin pallor, weight within the 25-50 percentile and height within the 50-75 percentile. No other findings.
+Complementary examinations: complete blood count, biochemistry, coagulation, urine culture, renal function, enolase, alpha-fetoprotein, chest X-ray and ECG were normal.
+Urinary sediment: macroscopic haematuria.
+Abdominal ultrasound: 5cm diameter mass in the left kidney, complex with cystic/necrotic areas.
+The paediatrics department consulted our department and decided to perform an abdominal CT scan with contrast after ultrasound findings, with the finding of a mass depending on the left kidney, in the anterior face, with cystic content and irregular endoluminal thickening. It presents a thick and irregular septum of similar density to that obtained in the internal irregularities described. No inter-cavo-aortic or periaortic adenomegaly was observed.
+The mass is compatible with Wilms' tumour or adeno-carcinoma.
+It was decided to perform a left nephrectomy: the mass measured 4.5 cm in diameter.
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+The anatomopathological diagnosis was cystic mesoblastic nephroma (multilocular renal cyst).
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