title: Angioma-like pseudometamorphosis in Wilms' tumors subjected to preoperative radio- and chemotherapy.
abstract: Six Wilms' tumors (stage III-V), which had undergone preoperative irradiation and chemotherapy, were examined histologically. While mesenchymal and differentiated epithelial tumor elements were preserved to a large extent, blastemic tumor structures were almost completely lacking. Instead, pseudoangioma-like structures similar to cavernous hemangioma prevailed. As demonstrated by transitional pictures, the pseudoangioma-like pattern is a result of the fact that blastemic tumor elements are replaced by blood after therapy-induced necrosis and lysis. The clinical advantages of preoperative treatment are briefly discussed, especially for patients with advanced tumors.
mesh_terms: D002648:Child; D002675:Child, Preschool; D005260:Female; D006392:Hemangioma, Cavernous / Q000473:pathology; D006801:Humans; D007223:Infant; D007680:Kidney Neoplasms / Q000188:drug therapy / Q000473:pathology* / Q000532:radiotherapy; D008297:Male; D008679:Metaplasia; D009392:Nephrectomy; D011300:Preoperative Care; D009396:Wilms Tumor / Q000188:drug therapy / Q000473:pathology* / Q000532:radiotherapy