Mixed epithelial and stromal tumor of the kidney (MEST).

OBJECTIVE: To report an unusual case of renal tumor and review the literature. METHODS: We present a 20 years old female with a history of acute right pyelonephritis. The ultrasound study revealed a tumor-like image in the lower pole of the right kidney . The CT-scan showed a mixed solid and cystic mass of 7 cm. in the lower pole of the right kidney. RESULTS: A right laparoscopic partial nephrectomy was performed. The total operative time was 90 minutes, with 24 minutes of warm ischemia. The estimated blood loss was 50 ml. and the length of stay (LOS) 36 hours. The pathology findings confirm a mixed epithelial and stromal tumor (MEST) of the kidney. CONCLUSION: Mixed epithelial and stromal tumor (MEST) of the kidney is a benign and rare condition that doesn't show a clear difference with other renal tumors in image studies. Nephron-sparing surgery with margin study is the standard treatment when is feasible.

Tumor mixto epitelial-estromal renal (MEST) / Mixed epithelial and stromal tumor of the kidney (MEST)

OBJETIVO: Reportar el caso de un tumor renal infrecuente y revisión de la literatura. MÉTODOS: Presentamos una paciente de sexo femenino de 20 años de edad con antecedente de pielonefritis aguda derecha y que en estudio ecográfico se constató una imagen de aspecto tumoral en polo inferior del riñón derecho interpretada en primera instancia como teratoma. La tomografía computada mostró una masa solido-quística de 7 cm. de diámetro en polo inferior renal derecho. RESULTADOS: Se realizó una nefrectomía parcial laparoscópica en un tiempo operatorio de 90 minutos y de isquemia caliente de 24 minutos. El sangrado estimado fue de 50 ml. y la estadia hospitalaria fue de 36 horas. El estudio histopatológico informó un tumor benigno estromal-epitelial de riñón. CONCLUSIÓN: El tumor benigno estromal-epitelial (MEST) de riñón es una entidad rara que no presenta una clara diferencia con otros tumores renales en el preoperatorio. Corresponde a un hallazgo en el estudio histológico. La cirugía conservadora es el tratamiento estándar siempre que sea factible de realizar (AU)

OBJECTIVE: To report an unusual case of renal tumor and review the literature. METHODS: We present a 20 years old female with a history of acute right pyelonephritis. The ultrasound study revealed a tumor-like image in the lower pole of the right kidney . The CT-scan showed a mixed solid and cystic mass of 7 cm. in the lower pole of the right kidney. RESULTS: A right laparoscopic partial nephrectomy was performed. The total operative time was 90 minutes, with 24 minutes of warm ischemia. The estimated blood loss was 50 ml. and the length of stay (LOS) 36 hours. The pathology findings confirm a mixed epithelial and stromal tumor (MEST) of the kidney. CONCLUSION: Mixed epithelial and stromal tumor (MEST) of the kidney is a benign and rare condition that doesn’t show a clear difference with other renal tumors in image studies. Nephron-sparing surgery with margin study is the standard treatment when is feasible (AU)