8. Choice D is the correct answer. Wilms Tumor is the most common intra-renal malignant tumor in childhood. Renal cel carcinoma is the most common renal cancer in adults. Ewing sarcoma is a non osseous round cell tumor that is frequently spread a the time of diagnosis. Langerhans Cell Histiocytosis is a group of diseases where there is infiltration of differentiated Langerhans cell histiocytes that can look like a malignancy.
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