Diagnosis of Rare Association of Orthotopic Multicystic Dysplasia with Crossed Fused Renal Ectopia
Abdomen US, day 0 of life (a)–(c). (a) and (b) sagittal images, solitary right kidney: cysts in the upper pole, increased renal parenchymal echogenicity, and mild dilatation of the renal pelvis (arrow); (c) right parasagittal image, bladder: mild dilatation of the right ureter extending to the ureterovesical junction (arrow). Abdomen US, 6 months of age (d)–(h). (d) sagittal image, right flank: noncommunicating cysts with no intervening renal parenchyma consistent with a right multicystic dysplastic kidney (arrow) and moderate hydronephrosis of the inferior crossed fused left kidney; (e) sagittal image shows increased renal parenchymal echogenicity of the crossed fused left kidney with relative preservation of parenchymal thickness (arrow); (f) sagittal image shows moderate dilatation of the proximal left ureter to the right of midline consistent with crossed fused ectopy; (g) transverse image, bladder: dilated distal left ureter confirms the crossed fused left renal ectopy; (h) sagittal image, bladder: dilated tapered atretic right ureter.