Normal özofagus ve BT değerlendirmesi BT bulguları

Özet

Özofagus, farinksi mideye bağlayan ve servikal, torasik, kısa abdominal bölümleri olan kaslı bir kanaldır. Özofagus toraks BT'sinde kollabe olabilir; oral kontrastla yeterli distansiyon sağlanması duvar kalınlığını değerlendirmeye yardımcı olur ve kollabe durumdaki yalancı kalınlaşmayı azaltır. Toraks BT'sinde özofagusun dış konturu, çevresindeki mediastinal yağ planları ve lümenin kollabe ya da distandü görünümü değerlendirilir; oral kontrastla yeterli distansiyon, kollabe özofagusta yalancı duvar kalınlaşmasını azaltır. Özofagus kollapsı nedeniyle oluşan yalancı duvar kalınlaşması, uygun distansiyon sağlanmadığında patolojik kitle veya tutulum olarak yanlış yorumlanabilir.

Okuma sırası

karina arkasındaki özofagus. Özofagusun torasik bölümünü posterior mediastinumda, desendan aortanın önünde ve sağında izleyin; T4-T5 düzeyinde aort kavsi ve sol ana bronşla çaprazlaşmasını ardışık kesitlerde doğrulayın.
karina ve sol ana bronş. T4-T5 seviyesinde özofagus, sol ana bronş ile çakışan daralma bölgesindedir ve komşu yapının ayrımında bu anatomik ilişki referans alınır.
özofagus-aorta aralığı. Desendan aortanın ön-sağ komşuluğundaki özofagus dış konturunu izleyin; aradaki yağ planının kesintisiz olup olmadığını karşı taraf ve komşu seviyelerle kıyaslayın.
özofagusun tüm seyri ve hiatus. Gastroözofageal bileşke ve alt torasik özofagus, yeterli oral distansiyon sağlanmış aksiyel ve sagittal çapraz kesitlerde komşu yapılarla ilişkisiyle birlikte değerlendirilmeli; kollaps nedeniyle yalancı duvar kalınlaşması riskine dikkat edilmelidir.

Faz ve pencere

Portal tanısal: Rutin kontrastlı toraks BT'de özofagus lümeni sıklıkla hava ya da az miktarda sıvı içerir; duvar kalınlığı distansiyon ve kasılmaya göre değişir. İntravenöz kontrast, duvar dışı yağ planları ile mediastinal damar ve organ komşuluğunu seçmeyi kolaylaştırır; normal özofagus için ayrı bir arteriyel faz gerekmez.

Önerilen pencereler G genişlik, M merkez; değerler Hounsfield birimi (HU)

MediastenG 350 / M +50

BT bulguları

Torasik özofagus posterior mediastinumda, desendan torasik aortanın önünde ve sağında seyreder.
Özofagusun ikinci fizyolojik daralması, aort kavsi ile sol ana bronşun çaprazlaştığı T4-T5 düzeyindedir.
Üçüncü fizyolojik daralma, alt özofageal bileşke düzeyinde T11 seviyesinde tanımlanır.
Lümen değişken biçimde hava, sıvı veya kollabe görünür; tek kesitteki duvar kalınlığı distansiyon düzeyinden bağımsız yorumlanmamalıdır.
Özofagus dış çevresindeki mediastinal yağ planı belirgin olmalı; fokal yumuşak doku, çevre yağda çizgilenme veya komşu yapı konturunda bozulma normal varyasyon sayılmaz.
Hiatal hernide abdominal içerikler özofageal hiatus üzerinden mediastinuma uzanabilir.

Ölçütler ve sınıflamalar

Oral kontrastla yeterince distandü normal özofagusta duvar kalınlığı; kollabe segmentte eşik olarak kullanılmaz: <2 mm

Normalde

Normal karşılaştırmada torasik özofagusun posterior mediastinumda desendan aortanın önünde ve sağında seyrettiğini, ikinci fizyolojik daralmanın ise T4-T5 düzeyinde aort kavsi ile sol ana bronşun çaprazlaşmasında olduğunu izleyin. Desendan aorta ile özofagus arasındaki yağ planı seçilir; lümen kollabe olsa bile odaksal dış kontur çıkıntısı, asimetrik duvar kalınlaşması veya çevre yağda silinme olmamalıdır. Özofagus duvar kalınlığı distansiyona bağlıdır; oral kontrastla yeterince distandü segmentte 2 mm’den azdır ve kollabe segmentte yalancı kalınlaşma görülebilir.

Normal BT ile kıyasla

Aynı bölgenin, kaynak veri setinde patoloji içermediği belirtilen bir BT incelemesini kesit kesit kaydırın; organ sınırlarını açarak anatomiyi hasta görüntüsüyle karşılaştırın. Küçük rastlantısal bulgular tümüyle dışlanmamıştır.

Kaynak: TotalSegmentator v2.01 veri seti (Wasserthal ve ark., Radiology: Artificial Intelligence 2023), CC BY 4.0, vaka s1278; organ sınırları veri setinin otomatik segmentasyonundan, birleştirilerek sadeleştirildi. Görüntüler 2,5 mm kesit aralığına yeniden örneklendi.

Ayırıcı tanı

Kollabe özofagus: uzun bir segmentte simetrik duvar kıvrımları ve lümen daralması izlenir; sıvı ya da oral kontrastla açılan segmentte kalınlık azalır.
Hiatal herni: hiatus üstündeki mide kardiyası/fundus devamlılığı ve gastroözofageal bileşkenin yukarı yer değiştirmesi görülür.
Özofagus divertikülü: lümenle boyun aracılığıyla devam eden, çoğunlukla hava veya oral kontrast içeren kese biçimli çıkıntıdır.

Tuzaklar

Kollabe lümen duvarı yalancı kalın gösterir; fokal asimetriyi başka kesitlerde ve koronal/sagittal reformasyonlarda izleyin, yalnız bir aksiyel ölçüme dayanmayın.
Sol ana bronş veya sol atriuma ait yumuşak doku dansitesi özofagus duvarı sanılabilir; komşu kesitlerde tübüler lümen devamlılığını takip edin.

Kendini dene

Desendan torasik aortanın ön-sağ tarafında, T4-T5 seviyesinde kollabe özofagus lümeni izlenir; çevresindeki yağ planları belirgindir. En olası görünüm nedir?
Cevabı göster
Normal kollabe özofagus. Çevresinde belirgin yağ planı bulunan, T4-T5 seviyesinde desendan aortanın önünde yer alan kollabe özofagus yapısı normal anatomidir. Özofagus kanseri BT'de infiltratif veya polipoidal yumuşak doku kütlesi olarak görünür ve komşu yapılarda yağ planı kaybına neden olabilir.
Hiatal herniyi tanımlayan bulgu hangisidir?
Cevabı göster
Abdominal içeriklerin özofageal hiatus üzerinden mediastinuma protrüzyonu. Hiatal herni, abdominal içeriklerin diyaframın özofageal hiatusundan mediastinuma protrüde olmasıdır.

İlgili konular

Kaynaklar

Bu sayfadaki 32 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla otomatik olarak karşılaştırıldı; 9 cümle bu karşılaştırmada düzeltildi (2026-10-09).

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Eğitim amaçlıdır; hasta başında tanı ve tedavi kararının yerine geçmez, tıbbi tavsiye değildir. Metinler yapay zekâ desteğiyle yazıldı ve otomatik bir adımda kaynak alıntılarıyla karşılaştırıldı; bu bir tıbbi doğrulama değildir ve içerik uzman radyolog incelemesinden geçmedi. Klinik kararlarda güncel kılavuzları, kurum protokollerini ve radyoloji raporunu esas alın.