Tumor de Wilms / Wilms' tumor

Resumen El tumor de Wilms es el tumor renal maligno más frecuente de la infancia, representa incluso 7% de las neoplasias a esta edad. El tratamiento que ha mostrado efecto en la supervivencia de estos pacientes es, sin duda alguna, la cirugía, con tasas de éxito de hasta 90% durante los primeros estadios de la enfermedad, esta tasa disminuye tras la progresión de los estadios. Sin embargo, la mayoría de los casos que se encuentran en etapas tempranas se presentan como hallazgos radiográficos o a la exploración física como masa abdominal palpable. Se comunica un caso clínico que muestra la importancia del diagnóstico oportuno en estos pacientes.

Abstract Wilms' tumor is the most frequent malignant kidney tumor of childhood, presented over 7% of neoplasms at this age. The treatment that has demonstrated impact on the survival of these patients is, without a doubt, the surgery, with success rates of up to 90% during the first stages of the disease, decreasing this index after the progression of the stages. However, most cases that are found in the early stages are presented as radiographic findings or physical examination as palpable abdominal mass. So, this paper reports a clinical case, which shows the importance of timely diagnosis in these patients.

Clear Cell Sarcoma of the Kidney: Report of two cases

Clear cell sarcoma is a rare malignant rumor of the kidney which occurs in children and is differentiated from Wilms' tumor by its different clinicopathologic features and natural history. Previous studies indicate that this tumor may be of mesenchymal cell origin; however, this has not been proven conclusively. Further accumulation and study need to be conducted in order to clarify the histogenesis of this tumor. We report two cases of clear cell sarcoma of the kidney which occurred in a 2 and a half-year old and a 2-year old boy. This report places special emphasis on the clinicopathologic characteristics of these two cases including electron microscopic and immunohistochemical findings. Attempts were also made to differentiate the clinicopathologic aspects of clear cell sarcoma from Wilms' tumor and speculate on the histogenesis of this rumor.