@entity12878 is an uncommon @entity703 of infancy and rarely occurs in adults. We report a case of @entity12878 in adult. A 22-year-old @entity1 , who presented with left @entity812 , was found to have a left renal mass by abdominal ultrasonography. Computed tomography revealed a heterogeneous @entity5 . Left radical nephrectomy was performed. The @entity5 was a creamy white solid mass. Microscopically, the @entity5 was composed of spindle cell proliferation. Atypia and mitoses were not identified. Among the @entity5 cells, there were tubular arranged epithelial elements. The @entity1 was free of recurrence 18 months postoperatively. @entity12878 is classified as a @entity5 but recurrence and malignant transformation of this @entity5 have been reported, so regular postoperative follow up is required.

XXXX in a 22 Years Old @entity1 .

@entity1 :: ('9606', 'Species') :: ['woman', 'patient'] @entity5 :: ('MESH:D009369', 'Disease') :: ['tumor', 'benign tumor'] @entity812 :: ('MESH:D021501', 'Disease') :: ['flank pain'] @entity12878 :: ('MESH:D018201', 'Disease') :: ['Mesoblastic nephroma', 'mesoblastic nephroma'] @entity703 :: ('MESH:D007680', 'Disease') :: ['renal tumor']
@entity12878 :: (MESH:D018201,Disease) :: ['Mesoblastic Nephroma']
