005K Multicystic Dysplastic Lidney 2 Month Old Presents with a Cystic Abnormality of the Left Kidney on Ultrasound Cystic Abnormality of the Left Kidney on Ultrasound2 Month old presents with a abdominal mass and a cystic abnormality of the left kidney on ultrasound. US in the longitudinal plane shows multiple anechoic cysts of varying size, with evidence of backwall enhancement and through transmission. The kidney measures 9.6cms (normal at this age 4-5cms)Final diagnosis was multicystic dysplastic left kidney and normal right kidneyAshley Davidoff MD TheCommonVein.net 2 Month old presents with an abdominal mass and a cystic abnormality of the left kidney on ultrasound. US in the longitudinal plane of the right kidney shows a normal kidney with normal corticomedullary differentiation. It measures 7cms which is enlarged and likely reflecting compensatory hypertrophy. (normal at this age 4-5cms)Final diagnosis was multicystic dysplastic left kidney and normal right kidneyAshley Davidoff MD TheCommonVein.net The pathology specimen shows multiple cysts of varying size with thick bands of tissue traversing the dysplastic cystic kidneyDiagnosis of multicystic dysplastic kidneyAshley Davidoff MD TheCommonVein.net Photomicrograph (H and E stain) shows dilated cyst lined by flattened epithelium (light blue arrowhead), dysplastic primitive appearing tubules were lined by cuboidal to columnar columnar epithelium surrounded circumferentially arranged a cells (white arrowhead) and a flattened cyst (dark blue arrow) An immature glomerulus is suggested (yellow arrowhead)Diagnosis of multicystic dysplastic kidneyAshley Davidoff MD TheCommonVein.net