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原發性腸系膜腫瘤在電腦斷層攝影學上的診斷
Radiological Diagnosis in Primary Mesenteric Tumor
摘要
腸系膜原發性腫瘤遠比轉移性為少，因為腸系膜分佈廣而有相當大的移動陸，故待病人審覺腫瘤的有在而來就醫時，通常體積已十分龐大了。在放射線學上的診斷，腸系膜與肝瞻道、脾臟、胰臟無關連，與胃腸道關係雖較密切，但以移位為主，並自腫瘤位置及大小腸移位情況可以臆測腫瘤之原發位置。傳統性X光並沒有太大的幫助。血管攝影主要以血管伸張為主，並不具特異性。超音波可以區分大部分的液態或固態腫瘤，在分別單純性或出血性囊腫方面優於電腦層攝形(computed tomographyCT）。CT為一直接，客觀而有效的一種檢查方法，可以確定腫瘤位置，大小及其展延範圍，對有特定衰減係數的囊腫及脂肪瘤，診斷並不困難。對比劑有助於察看腫瘤內有無壞死，但顯影強度的不同並不能臆測病理結果，其中包括血管周圍瘤在內，此外，CT亦可作病例追綜在測量復發及轉移狀況均可提供重要資料。
關鍵字
無資料並列摘要
Primary mesenteric tumor is far less than those that come from metastasis. The mesentery distributes over a large area and relatively mobile, as a result, when patients with primary mesenteric tumor approaches medical help, the tumor is usually of enormous size. The mesentery is neither related to the biliary system, spleen nor the pancreas. It is related to the gastrointestinal tract but its primary tumors displaced the hollow organs as the major sign. Conventional radiological examinations do not show much help but they can indicates the primary site of the tumor by its location and the portion of the hollow organ that it displaces. Angiography is not specific but always shows the stretching of vessels. Sonography is useful in differentiating cystic tumors from solid ones. Furthermore sonography can show the difference between simple cyst and hemorrhagic cyst. Computed tomography (CT) is a more direct, more objective as well as a more effective method for examination. It can clearly locate the position of the tumor, its size and its boundary. With the measurement of attenuation values, it can identified some particular tumors that related with specific densities. and lipomas. The use of contrast enhancement benefits the identification of tumor necrosis but the degree of enhancement is not specifically pathognomonic, even in the case of hemangiopericytoma. Furthermore CT can be used as a tool for follow-up, identification of recurrence or metastasis.