İntervertebral disk dejenerasyonu ve vakum fenomeni BT bulguları

Özet

Bel veya boyun ağrısı nedeniyle BT çekilen erişkinde disk dejenerasyonu sık rastlanan kronik bir bulgudur ve görüntüdeki her dejenerasyon semptomun nedeni değildir. Kontrastsız BT disk aralığı, son plak ve osteofitleri iyi gösterir; dejeneratif fissürlerdeki azot ağırlıklı gazı, yani vakum fenomenini, özellikle duyarlı biçimde ortaya koyar. BT, diskin su içeriğini ve sinir dokusu etkilenmesini MR kadar değerlendiremez; belirgin gazı tek başına instabilite ya da ağrı kanıtı saymak doğru değildir. Dejeneratif vakumun enfeksiyon içi gazla veya eşlik eden kemik yıkımının gözden kaçması, kronik değişikliğin yanlış sınıflanmasına yol açabilir.

Faz ve pencere

Kontrastsız tanısal: İntradiskal gaz, disk aralığı içinde çok düşük atenüasyonlu siyah odak veya ince yarık biçiminde görünür; doğrusal/yarımay biçimli gaz birden fazla kesitte izlenebilir. Dejeneratif bağlamda disk yüksekliği kaybı, son plak sklerozu ve marjinal osteofitler eşlik edebilir; vakum fenomeni en iyi kontrastsız BT ile güvenilir biçimde ortaya konur.
Kemik algoritması tanısal: Sagittal ve koronal rekonstrüksiyonlarda disk aralığı boyunca gazın dağılımı, son plak korteksindeki düzensizlik veya skleroz ve osteofitlerin düzeyi belirginleşir; gazın vertebra gövdesi ya da paravertebral yumuşak dokuya uzanıp uzanmadığı ayrıca kontrol edilir.

Önerilen pencereler: Kemik (G 1800 / M 400), Yumuşak doku (G 400 / M 40).

BT bulguları

Disk aralığı kaybı — komşu vertebra son plakları birbirine yaklaşmış ve disk yüksekliği azalmıştır.
İntradiskal vakum — diskin içinde keskin sınırlı, hava atenüasyonunda lineer veya fokal gaz bulunur.
Son plak sklerozu — dejeneratif süreçte komşu vertebral son plaklarda görülen subkondral kemik yoğunlaşmasıdır.
Marjinal osteofit — vertebra düzeyinde görülebilen bir osteofit oluşumudur.
Disk kalsifikasyonu — gazdan daha yoğun, kemik atenüasyonlu materyal disk içinde veya annulus boyunca izlenir.
Faset eklem artrozu — posterior eklemlerde dejenerasyona bağlı olarak gelişen osteoartritik değişikliklerdir.
İntradiskal gazın kanala göçü — nadiren epidural gaz odağı kitle etkisi yapabilir; gazın diskten devamlılığı araştırılır.

Ölçütler ve sınıflamalar

Pfirrmann disk dejenerasyonu sınıflaması (MR temelli): I: homojen parlak disk, nükleus-annulus ayrımı net ve yükseklik normal; II: hafif heterojenlik/bantlar, ayrım korunur; III: gri heterojen sinyal ve belirsizleşen ayrım; IV: koyu heterojen disk, ayrım kayıp ve yükseklik azalabilir; V: ileri sinyal kaybı ve kollabe disk aralığı. Bu derecelendirme MR sinyaline dayanır, BT'de doğrudan uygulanmaz.

Normalde

Aynı seviyedeki normal diskin yüksekliği komşu seviyelerle uyumludur; vertebral son plaklar düzgün ve kesintisiz, kenarlar belirgin osteofitsiz görünür. Normal disk aralığında vakum fenomeni gözlenmez; vakumun varlığı ileri derecede dejenerasyonun göstergesidir.

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 s1338; organ sınırları veri setinin otomatik segmentasyonundan, birleştirilerek sadeleştirildi. Görüntüler 2,5 mm kesit aralığına yeniden örneklendi.

Ayırıcı tanı

Disk aralığı enfeksiyonu: düzensiz/destrüktif son plak erozyonu ve paravertebral koleksiyon, basit dejeneratif sklerozdan daha kuşkuludur.
Vertebra korpus vakumu: gaz disk aralığında değil, çökmüş korpus içindeki yarıkta yer alır; kırık ve osteonekroz bağlamı aranır.
Epidural gaz: spinal kanalda diskten ayrılmış gaz odağı görülebilir; olası intradiskal kaynakla süreklilik ve kanal içi yerleşim gösterilir.
Disk kalsifikasyonu: kemik atenüasyonlu yoğunluk gaz gibi siyah değildir ve annulus boyunca plak/çizgi biçiminde uzanabilir.
İşlem sonrası disk içi hava: yakın tarihli girişim ve cerrahi öyküsü dejeneratif spontan vakum yorumunu değiştirir.

Tuzaklar

Tek kesitte görülen siyah odak parsiyel hacim veya görüntü gürültüsü olabilir; komşu aksiyel kesitlerde ve sagittal planda disk içinde devamlılığını doğrula.
Vakum fenomeni ileri dejenerasyonla ilişkili olsa da ağrılı seviyeyi tek başına belirlemez; semptom tarafı ve nöral etkilenme BT ile kanıtlanamayabilir.
Disk ve son plak çevresindeki gazı spondilodiskit olarak adlandırmadan önce son plak yıkımı, paravertebral yumuşak doku ve işlem öyküsünü birlikte gözden geçir.
Dekübit pozisyon ve segment hareketi intradiskal gazın biçimini değiştirebilir; küçük gaz odağı yokluğu dejenerasyonu dışlamaz.

Kendini dene

Bel ağrılı hastanın kontrastsız BT'sinde L5-S1 diskinde siyah yarık ve karşılıklı son plak sklerozu var. En olası bulgu nedir?
Cevabı göster
Vakum fenomeni. Disk aralığı içindeki hava atenüasyonlu yarık, dejeneratif daralma ve sklerozla birlikte vakum fenomenini destekler. Disk kalsifikasyonu dejeneratif değişikliklerde gelişebilir ve en sık annulus fibrosusu tutar; enfeksiyöz spondilodiskitte son plak yıkımı ve paravertebral apse görülebilir.
Diskte gazla birlikte son plaklarda düzensiz yıkım ve paravertebral koleksiyon görülüyor. Hangi tanı öncelikle düşünülür?
Cevabı göster
Spondilodiskit. Destrüktif son plak değişikliği ve paravertebral koleksiyon enfeksiyonu destekler. Dejeneratif vakumda tipik olarak disk aralığı daralması, skleroz ve osteofitler öne çıkar; faset artrozu posterior eklemdedir, çökme ise korpus yüksekliğini azaltır.

Kaynaklar

Bu sayfadaki 41 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla tek tek karşılaştırıldı; 6 cümle bu karşılaştırmada düzeltildi (2026-10-09).

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