Multiphasic contrast-enhanced CT and MRI findings of adult mesoblastic nephroma: A report of two cases
A 47-year-old woman presented with an incidentally detected renal mass on a routine physical exam. The results of the laboratory examination were unremarkable. Ultrasound examination of the kidneys detected a 5.5-cm, well-delineated, partly cystic mass located in the middle polar of the left kidney (not shown). T2-weighted imaging (T2WI) demonstrated a heterogeneous predominantly hypointense mass with interspersed stellate-like hyperintensity []. Mass was isointense relative to renal parenchyma on T1-WI with areas of low signal intensity []. The lesion presented mild patchy enhancement on the corticomedullary phase (CMP) [] and progressive heterogeneous enhancement on the nephrographic phase (NP) and pyelographic phase (PP) [Figure and , respectively]. Multiphasic images consisting of CMP (20-30 sec), NP (80 sec) and PP (120 sec) phases were acquired after the administration of contrast material. There was no suggestion of lymphadenopathy or renal vein involvement on any of the sequences. The patient was diagnosed as renal cell carcinoma and underwent radical left nephrectomy. The pathologic diagnosis was an MN []. The patient was free of disease on the 1-year follow-up examination.