EXTRARENAL Wilms" tumor is extremely rare. Approximately 54 cases have been reported in the world literature through 1993. Only eight EXTRARENAL Wilms" tumors were enrolled in the National Wilms" Tumor Study (NWTS) between 1980 and 1986. These cases constituted a fraction of 1% of all Wilms" tumors reported to the N.W.T.S during this period. The authors report a case of RETROPERITONEAL Wilms" tumor (Stage III) presenting as a lower abdominal mass in a previously healthy 6-year-old girl who was operated and staged according to the current N.W.T.S III criteria.

The image recognition and the classification of objects according to the images are more in focus of interests, especially in medicine. A mathematical procedure allows us, not only to evaluate the amount of data per se, but also ensures that each image is processed similarly. Here in this study, we propose the power of shape analysis, in conjunction with neural networks for reducing white noise instead of searching an optimal metric, to support the user in his evaluation of MRI of renal tumors. Therapy of renal tumors in childhood bases on therapy optimizing SIOP (Society of Pediatric Oncology and Hematology) -study protocols in Europe. The most frequent tumor is the NEPHROBLASTOMA. Other tumor entities in the retro peritoneum are clear cell sarcoma, renal cell carcinoma and EXTRARENAL tumors, especially neuroblastoma. Radiological diagnosis is produced with the help of cross sectional imaging methods (computer tomography CT or Magnetic Resonance Images MRI). Our research is the first mathematical approach on MRI of RETROPERITONEAL tumors (n=108). We use MRI in 3 planes and evaluate their potential to differentiate other types of tumor by Statistical Shape Analysis. Statistical shape Analysis is a methology for analyzing shapes in the presence of randomness. It allows to study two- or more dimensional objects, summarized according to key points called landmarks, with a possible correction of size and position of the object. To get the shape of an object without information about position and size, centralization and standardization procedures are used in some metric SPACE. This approach provides an objective methodology for classification whereas even today in many applications the decision for classifying according to the appearance seems at most intuitive.We determine the key points or three dimensional landmarks of RETROPERITONEAL tumors in childhood by using the edges of the platonic body (C60) and test the difference between the groups (NEPHROBLASTOMA versus non-NEPHROBLASTOMA).

Although rhabdomyosarcoma (RMS) is one of the most common malignant tumors in infants and children, RMS of the kidney is extremely rare. In fact, among the three subtypes of RMS, alveolar RMS occurs more often in large muscles of the trunk, arms and legs and typically affects older children or teenagers. Here we report a case of alveolar RMS of the kidney in a 6-month-old girl with the imaging findings.This article shows that the "claw sign" in CT scan, which is described in wilms tumor, can be seen in other renal masses in children and the aggressive nature of tumor growth should arise suggestion of other rare renal masses such as RMS.

Liposarcoma are one of the common soft tissue sarcomas of adulthood which are remarkable because of their frequently large size. We report a case with an extremely large well-differentiated RETROPERITONEAL liposarcoma that weighted 32 kilograms. The patient had relapse about one year later and two recurrent tumors were successfully excised.

Background: Rhabdomyosarcoma (RMS) is one of the common malignant tumors in infants and children, but it is extremely rare in the kidney. In this paper, we present a case of RMS the kidney of a child.Case presentation: A 6-month old girl presented with agitation, low fever and abdominal distention which started 5 days ago. On physical examination, the infant had a large and firm soft tissue mass in the palpation of her abdomen.Plain abdominal x-ray, sonography and CT scan showed soft tissue mass and Doppler ultrasound demonstrated regions of vascular flow in mass. The abdominal mass was replaced and on pathological examination and immunohistochemistry the diagnosis was embryonal RMS.Conclusion: Rhabdomyosarcoma of the kidney should be considered in the differential diagnosis of children with huge abdominal mass.

Wilms’,tumor is one of the commonest abdominal tumors of childhood, primarily a malignant renal tumor. However, EXTRARENAL Wilms’,tumor (ERWT) is a rare disease, and only a few cases have been reported in the pediatric age group. Here we report a child with RETROPERITONEAL mass, who had ERWT.

Introduction Renal cell carcinoma (RCC) is the most common type of kidney tumor. The extra-renal type has been previously reported only by few studies. In this type of RCC, cancerous tissue is present in regions other than the kidney. Here we present an isolated renal mass (RM), which was primarily diagnosed as an adrenal mass. Case presentation A 52-year-old male presented with left flank pain, without weight loss, visible hematuria, and hydronephrosis was the case of this study. Computed tomography (CT) scan revealed a mass which could be either an adrenal tumor, RETROPERITONEAL diagnosis, or a renal upper bridge tumor. The kidney mass was seen above the junction of middle and upper renal bridges. Its surrounding was liberated from the Gerota. The kidney mass was independent and encapsulated of the kidney but adhered to its surface. It was gradually released from the capsule and was extracted. The capsule beneath the mass was intact, and the site had no bleeding. The mass was then placed in endobag and removed from port ten and the entrance of port ten was sutured during a six-month followup there was no hydronephrosis and no evidence of urinoma around the kidney. Conclusions Rare cases of EXTRARENAL RCC which attach to the kidney Can be removed without any damage to the kidney.