- 期刊
Air CT呈陰性而一年後MRI呈陽性的聽神經瘤－病例報告
Acoustic Neuroma Presenting as Negative Air CT Finding and Positive MRI Result in a Year - Case Report
摘要
目前對於小腦橋腦角（Cerebellopontine angle, CPA）腫瘤的診斷，主要仍藉助於氣腦池電腦斷層掃瞄（computed tomography with air cisternography, air CT）或核磁共振映像術（magnetic resonance imaging, MRI）。本文報告一男性病人，在他院實施air CT檢查為陰性，而一年後在本院實施MRI檢查為陽性，即左側小腦橋腦角有腫瘤顯影，並開刀證實為左側聽神經瘤之病例。在此比較air CT與MRI對於CPA腫瘤診斷之價值，並討論air CT之偽陰性結果。 air CT之缺點為：1)具侵襲性；2)偽陽性及偽陰性的報告高於MRI；3)無法早期診斷小的內聽道內腫瘤；4)需曝露於輻射線。至於MRI的優點則是：1)非侵襲性；2)敏感度高；3)使用之顯影劑安全，副作用少，不易引起過敏反應；4)無輻射曝露之虞。總而言之，對於早期聽神經瘤的診斷，MRI實優於air CT。
並列摘要
The diagnosis of cerebellopontine angle (CPA) tumor to date is still based on computed tomography with air cisternography (air CT) or magnetic resonance imaging (MRI). A 49-year-old male patient with surgically proved left CPA tumor received air CT showing negative finding, while MRI performed at our hospital one year later revealed positive result. Air CT and MRI are compared in their diagnostic values on CPA tumor. The false negative report of air CT is also discussed. The major disadvantages of air CT are: 1)invasive, 2)higher false positive and false negative rates than MRI, 3)failure of early diagnosis of the intracanalicular tumor, and 4)radiation exposure. The major advantages of MRI are: 1)non-invasive, 2)higher sensitivity, 3)less adverse effects of the contrast medium used and 4)no radiation exposure. In conclusion, MRI is superior to air CT in the early diagnosis of CPA tumor.