BACKGROUND: Morphologic analysis of @entity703 of childhood and adolescence has resulted in the identification of a variety of @entity5 types with characteristic histology and clinical behavior. The authors report a case of @entity8 in a 19-year-old male that differs in morphology from the various established categories of primitive @entity703 . METHODS: Sections taken from the nephrectomy specimen were stained by routine methods and by immunohistochemistry for stromal and epithelial markers, and for proliferation markers. In addition, ultrastructural studies were undertaken. RESULTS: The @entity5 , which the authors termed cystic @entity2085 , was comprised of poorly differentiated malignant mesenchyme in a @entity4494 . Numerous epithelial-lined cysts were present. The distribution of the cysts and proliferation kinetics of cyst-lining epithelial cells suggested that they were derived from entrapped renal tubules. The @entity5 showed early recurrence postoperatively and after aggressive chemotherapy. The pathologic features and clinical behavior of the @entity5 resemble those of 2 previously reported cases and an additional 25 cases from the files of the National @entity3969 Study Pathology Center. CONCLUSIONS: The clinical and histologic features of cystic @entity2085 differ from those of other @entity703 of childhood and adolescence, and the @entity5 appears to be a novel form of @entity8 .

Cystic XXXX : a case report.

@entity8 :: ('MESH:D007674', 'Disease') :: ['renal malignancy', 'renal sarcoma'] @entity2085 :: ('MESH:D020964', 'Disease') :: ['embryonal sarcoma'] @entity5 :: ('MESH:D009369', 'Disease') :: ['tumor'] @entity4494 :: ('MESH:D045888', 'Disease') :: ['myxoid stroma'] @entity3969 :: ('MESH:D009396', 'Disease') :: ["Wilms' Tumor"] @entity703 :: ('MESH:D007680', 'Disease') :: ['malignant renal tumors', 'renal tumors']
@entity8 :: (MESH:D007674,Disease) :: ['embryonal sarcoma of kidney']
