[Renal neoplasms in children].

Unlabelled: Nephroblastoma is the most common kidney tumor in Polish children.

Objective: to present clinical material and outcome of 533 children with renal tumors.

Material: 500 pts with nephroblastoma and 33 of non-Wilms: CMN, RCC,CSSK, RTK and others tumors were registered, mean age 4.

High frequency ultrasound diagnostics of right lower quadrant abdominal pain in children.

In our study we tried to assess the usefulness of high frequency ultrasound examinations in the diagnostics of right lower quadrant abdominal pain, focusing on the differential diagnosis of appendicitis. Ultrasound examinations were performed on 152 patients aged 1 to 19 with abdominal pain. All the children underwent standard abdominal ultrasound examination with B mode of abdominal parenchymal organs as well as the evaluation of the intestines with the linear transducer of changeable frequency with the possibility of creating sector format.