Non-visualization of the kidney by excretory urography associated with neoplastic retroperitoneal masses in infants and children.
D000008:Abdominal Neoplasms; D002648:Child; D006801:Humans; D006869:Hydronephrosis; D007223:Infant; D007680:Kidney Neoplasms; D009447:Neuroblastoma; D012186:Retroperitoneal Neoplasms; D014567:Urography; D009396:Wilms Tumor
ABDOMINAL NEOPLASMS; HYDRONEPHROSIS; KIDNEY NEOPLASMS; NEPHROBLASTOMA; NEUROBLASTOMA; RETROPERITONEAL NEOPLASMS; UROGRAPHY