膀胱炎性肌纤维母细胞肿瘤的临床病理观察

目的探讨膀胱炎性肌纤维母细胞肿瘤的临床病理特点、诊断及鉴别诊断。方法采用HE、免疫组织化学（En Vision法）染色方法,观察5例膀胱炎性肌纤维母细胞肿瘤的组织学特点和免疫学表型,并对其中4例进行了随访。结果男性3例,女性2例,年龄10～53岁,平均年龄35岁;肿瘤位于膀胱顶底部3例,左侧壁2例,临床上表现为尿痛、血尿等症状。组织学表现为黏液丰富区和富于细胞区,梭形和星芒状肿瘤细胞散在或束状排列,间质可见大量纤细扩张的小血管网形成,各种炎细胞包括浆细胞、嗜酸性粒细胞、淋巴细胞及中性粒细胞的浸润。免疫组织化学检测显示瘤细胞AE1／AE3、波形蛋白、平滑肌肌动蛋白（SMA）、Calponin全部阳性,3例钙结合蛋白、4例结蛋白和4例间变性淋巴瘤激酶（ALK1）阳性。随访4例目前均存活,无复发。结论膀胱炎性肌纤维母细胞肿瘤是一种具有特殊临床病理特征的少见的中间型具恶性潜能的肿瘤。

Inflammatory myofibroblastic tumor of bladder: a clinicopathologic study of five cases

OBJECTIVE: To study the clinicopathologic features, diagnosis and differential diagnosis of inflammatory myofibroblastic tumor of the urinary bladder. METHODS: Excisional specimens from 5 cases of vesical inflammatory myofibroblastic tumor were studied by light microscopy and immunohistochemistry (EnVision). The clinical data were also analyzed. RESULTS: Among the 5 patients studied, 3 were males and 2 were females. The age of the patients ranged from 10 to 53 years (mean age = 35 years). The most common clinical presentation was micturition pain and hematuria. Three cases were located at the dome of the urinary bladder and the remaining 2 cases were found in the left lateral wall. Histologically, the tumor varied from myxoid to highly cellular. The tumor cells were spindle to stellate in shape, widely separated or showed a compact fascicular pattern. There were often associated with mixed inflammatory infiltrates and an irregular meshwork of small dilated vessels. Immunohistochemical study showed that the tumor cells expressed AE1/AE3 (5/5), vimentin (5/5), smooth muscle actin (5/5), calponin (5/5), caldesmon (3/5), desmin (4/5) and anaplastic lymphoma kinase protein (4/5). Follow-up data were available in 4 patients and none had local recurrence or died of this disease. CONCLUSION: Inflammatory myofibroblastic tumour of urinary bladder is a rarely encountered but distinctive neoplasm with intermediate malignant potential.