Journals / İzmir Tepecik Eğitim Hastanesi Dergisi / 2010 / Cilt: 20 - Sayı: 1

Comparing the diagnostic efficacy of ct colonography and conventional colonoscopy in detecting colorectal pathologies

Kolorektal patolojilerde BT kolonografinin tanı etkenliğinin klasik kolonoskopi ile kıyaslanması

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⚡ TL;DR(Too Long; Didn't Read)

In our opinion, the use of CT colonography should be reserved to follow up of the morphologic features of the lesions which were primarily detected by conventional colonoscopy.

📌 3 Key Takeaways

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Objective & Hypothesis:AIM: To compare the diagnostic efficacy of CT colonography and conventional colonoscopy in detecting colorectal lesions in adult patients with high risk of colorectal neoplasia.
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Key Findings & Data:MATERIAL AND METHODS: In all patients, CT colonography was performed by a 16-detector multi-slice scanner, followed by conventional colonoscopy.
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Conclusion & Impact:In our opinion, the use of CT colonography should be reserved to follow up of the morphologic features of the lesions which were primarily detected by conventional colonoscopy.
🔬Design:Research Article
📍Scope:Comprehensive Sample
⚙️Variables:Domain Parameters

Abstract

AIM: To compare the diagnostic efficacy of CT colonography and conventional colonoscopy in detecting colorectal lesions in adult patients with high risk of colorectal neoplasia. MATERIAL AND METHODS: In all patients, CT colonography was performed by a 16-detector multi-slice scanner, followed by conventional colonoscopy. Images were obtained with 1.25 mm slice thickness both in supine and prone positions, the latter with administration of i.v. iodinated contrast material. Virtual colonoscopic views were obtained through “Shaded Surface Display” software. Taking the conventional colonoscopy as the gold standard, sensitivity, specificity and Cohen's Kappa correlation coefficient were estimated for all lesions and polyps, seperately. FINDINGS: When all lesions are evaluated together, the sensitivity and spesifity of virtual colonography were 81,5% and 76,9%, whereas the sensitivity and spesifity calculated for polyps were 83,3% and 76.9%, respectively. In polyps with the diameter of 4 mm and over, sensitivity of CT colonography was 100%. With regard to the correlation between virtual colonoscopy and conventional colonoscopy, Cohen's Kappa coefficient was found to be fairly good (K=0.50-0.60). CONCLUSION: Due to the inefficiency in detecting small polyps and fairly good results in Kappa correlation analysis, CT colonography is unsuitable as a screening method. In our opinion, the use of CT colonography should be reserved to follow up of the morphologic features of the lesions which were primarily detected by conventional colonoscopy.

Özet

AMAÇ: Erişkin yaş grubundaki kolorektal kanser riski yüksek olgularda BT kolonografinin kolorektal lezyonları saptamadaki tanısal etkinliğini klasik kolonoskopi ile kıyaslamak. GEREÇ VE YÖNTEM: Çalışmanın yapıldığı yer Ege Üniversitesi Tıp Fakültesi Hastanesi Radyoloji Anabilimdalıdır. Olgulara önce BT kolonografi daha sonra kolonoskopi tetkiki yapıldı. BT kolonografi 16 almaçlı çok kesitli bir BT cihazı kullanarak yüz üstü ve sırt üstü konumlarda kontrastlı ve kontrastsız olarak alınan 1.25 mm kesit kalınlığındaki görüntülerle yapıldı. Tüm olgularda cihaz yazılımı içinde bulunan “Shaded Surface Display” (Üç Boyutlu Görüntüleme) yazılımı ile sanal kolonoskopik görüntüler elde edildi. Klasik kolonoskopi altın standart olarak kabul edilerek sanal kolonoskopide saptanan bütün lezyonlar ve polipler için duyarlılık, özgüllük hesaplamaları yapıldı ve Cohen’in Kappa uyum analizi gerçekleştirildi. BULGULAR: Olguların tümü birlikte değerlendirildiğinde sanal kolonoskopinin lezyon saptamadaki duyarlılığı %81.5, özgüllüğü %78.9 olarak hesaplandı. Polipler için hesaplanan duyarlılık %83,3 ve özgüllük %76,9 olarak bulundu. Dört mm ve üzeri çaptaki poliplerde BT kolonografinin duyarlılığı %100 idi. Lezyonların tümü ve polipler için yapılan Cohen Kappa uyum analizinde sanal kolonoskopiyle kolonoskopi arasındaki ilişki katsayısı orta-iyi derecedeydi (K=0.50-0.60). SONUÇ: BT kolonografi, 4 mm’den küçük polipleri saptamadaki etkinliğinin ve Kappa uyum analizi sonuçlarını orta-iyi derecede olması nedeniyle bir tarama testi olarak güvenilir değildir. Bu tetkikin lezyonların ilk tanısından çok, kolonoskopi ile saptanmış olan lezyonların morfolojik özelliklerinin izlemde kullanılması daha faydalı olabilir.

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Cite This Article

ENGİN, D., ERDOĞAN, N., ELMAS, N., ÖZÜTEMİZ, Ö., HARMAN, M., SEVER, A., ÖZEN, E. (2010). Comparing the diagnostic efficacy of ct colonography and conventional colonoscopy in detecting colorectal pathologies. İzmir Tepecik Eğitim Hastanesi Dergisi, Cilt: 20 - Sayı: 1, 1–11. https://ajindex.com/articles/268435

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