Chen H H, Chen J T, Ho W L
Department of Pathology, Taichung Veterans General Hospital, Taiwan, ROC.
Zhonghua Yi Xue Za Zhi (Taipei). 1999 Dec;62(12):896-900.
Metanephric adenoma is a recently described rare and benign renal neoplasm. Our patient, a 37-year-old woman, suffered from flank pain for five months and was found to have a renal mass. Ultrasound, computerized tomography and angiography findings were consistent with a hypovascular renal cyst. Wilms' tumor was the initial misdiagnosis, based on needle biopsy and aspiration cytology. A radical nephrectomy was performed. Histologically, the tumor was well defined and was composed of uniform small cells arranged in a solid, tubular or rosette-like pattern. The prognosis is good for metanephric adenoma. The tumor was first considered a benign counterpart of papillary carcinoma or Wilms' tumor; however, recent cytogenetic evidence suggested that the tumor might be related to papillary adenoma and papillary renal cell carcinoma. The clinical, radiologic, histologic and cytologic features presented here should help to promote the correct preoperative diagnosis and to avoid unnecessary aggressive treatment.
后肾腺瘤是一种最近才被描述的罕见的良性肾肿瘤。我们的患者是一名37岁女性，有五个月的侧腹痛，发现有一个肾肿块。超声、计算机断层扫描和血管造影结果与一个少血管性肾囊肿一致。基于针吸活检和细针穿刺细胞学检查，最初误诊为肾母细胞瘤。进行了根治性肾切除术。组织学上，肿瘤边界清晰，由排列成实性、管状或玫瑰花结样的均匀小细胞组成。后肾腺瘤的预后良好。该肿瘤最初被认为是乳头状癌或肾母细胞瘤的良性对应物；然而，最近的细胞遗传学证据表明，该肿瘤可能与乳头状腺瘤和乳头状肾细胞癌有关。本文所呈现的临床、放射学、组织学和细胞学特征应有助于促进正确的术前诊断，并避免不必要的积极治疗。
