Spinal kord basısı: BT'de kemik ve kanal işaretleri

Özet

Akut güçsüzlük, duyu seviyesi veya sfinkter bozukluğunda spinal kanal içindeki kemik ve yumuşak doku nedenleri hızlıca aranmalıdır. BT kemik korteksini iyi gösterir; epidural lezyonların saptanması ve omurilik basısının derecesinin değerlendirilmesinde MR tercih edilir. Bu nedenle normal ya da sınırlı BT görünümü klinik kord basısını dışlamaz ve MR'ın yerini tutmaz. Bası seviyesinin atlanması kalıcı motor, duyu veya otonom kayıpla sonuçlanabilir.

Faz ve pencere

Kontrastsız tanısal

BT kemik korteksini ve kortikal bütünlüğü değerlendirmede yararlıdır; erken epidural metastazları saptamadaki rolü sınırlıdır ve epidural lezyon şüphesinde MR tercih edilir. Klinik olarak metastatik kord basısı şüphesinde omurilik, epidural yumuşak doku ve bası düzeyi MR ile değerlendirilir; MR yapılamıyorsa BT kemik ve kanal anatomisi için kullanılır. Erken evre epidural metastazlar ve paravertebral yumuşak doku uzanımı BT ile saptanması zordur; BT epidural lezyonları yalnızca ileri evrede belirgin yumuşak doku kitlesi oluşturduğunda gösterebilir. BT, vertebra korteksini ve trabekülasyonu ayrıntılı göstererek kortikal bütünlük ve destrüktif değişikliklerin değerlendirilmesine yardımcı olur.

BT bulguları

• Osteofitler spinal kord basısına yol açabilen nedenler arasındadır.
• Kırıkla ilişkili kemik fragmanı kanal içine yer değiştirerek basıya yol açabilir.
• Epidural yumuşak doku — tümör, kanama veya enfeksiyon kanal içi yağ/dansite planlarını silerek dural kese alanını daraltabilir.
• Kanal konturunda fokal silinme — normalde kanal içinde seçilebilen epidural yağ veya dural kese sınırı kompresyon odağında kaybolur.
• Nöral foramen daralması çıkan spinal siniri sıkıştırabilir ve radiküler belirtilerle ilişkili olabilir.
• Paravertebral devamlılık — kanal içi kitlenin foramenden yumuşak dokulara uzanması nedenin kapsamını gösterir.
• BT yumuşak doku kontrast çözünürlüğü düşük olduğu için spinal kordun ödem, kontüzyon veya miyelopati gibi sinyal değişikliklerini ve gerçek bası derecesini güvenilir biçimde karakterize edemez.

Normalde

Spinal kanalın epidural aralığında epidural yağ, venöz pleksus, lenfatikler, küçük arteriyoller ve spinal sinirler bulunur. Epidural lezyonlar MR'da epidural yağı silebilir ve dural keseyi içe itebilir; erken epidural metastazların BT ile saptanması sınırlıdır.

Ayırıcı tanı

Kanal daralması; osteofit veya ekstrüde disk materyali, travmaya bağlı retropulse kemik fragmanı ya da epidural apse gibi nedenlerle oluşabilir. BT’de kemik bulguları daha belirgin; kord ve epidural yumuşak dokular için MR daha duyarlıdır.

Osteofitler spinal kord basısına yol açabilen dejeneratif nedenler arasındadır.

Kırıkla ilişkili kemik fragmanı kanal içine yer değiştirerek basıya yol açabilir.

Epidural kitle

vertebra korteksini aşan veya bağımsız yumuşak doku kitlesi epidural yağ planını siler.

Tuzaklar

• BT'de kordun belirgin seçilememesini kordun normal olduğu şeklinde yorumlama; MR, kord dokusu ve çevresindeki BOS'u gösterir.
• MR değerlendirmesinde sagittal T2 ağırlıklı görüntülere eklenen aksiyel T2 ağırlıklı görüntüler, kord basısı ve yer değiştirmesinin kapsamını daha ayrıntılı değerlendirmeyi sağlar.
• Omurganın yoğun kortikal kemiğine bağlı ışın sertleşmesi artefaktı, BT'de epidural metastaz bulgularını örtebilir.
• BT kemik korteksini iyi gösterse de epidural lezyonların ve omurilik basısının değerlendirilmesinde MR daha uygundur.
• Standart BT'nin erken epidural metastazları saptamadaki rolü sınırlıdır; MR yapılamadığında spinal kanal içeriğini ve bası derecesini değerlendirmek için BT miyelografi alternatif olabilir.

Kendini dene

1. BT'de spinal kanal çapı normal görünüyor; hastada yeni ilerleyen bacak güçsüzlüğü ve duyu seviyesi var. Kord basısını dışlamak için en uygun inceleme hangisidir?

   • Tüm omurga MR
   • Tekrar kontrastsız BT
   • Direkt grafi
   • Kemik sintigrafisi
   Cevabı göster

   Tüm omurga MR. MR kord parankimini, epidural alanı ve BOS çevresini değerlendirir; normal görünen BT yumuşak doku/kord patolojisini dışlamaz. Tekrar BT ve direkt grafi kord sinyalini göstermez.

2. Sagittal BT'de kanal dar; aksiyel kesitte posterior vertebra duvarından ayrılan kortike fragman görülüyor. En olası neden nedir?

   • Retropulse kırık fragmanı
   • Epidural lipomatozis
   • Diskit
   • Spinal kord ödemi
   Cevabı göster

   Retropulse kırık fragmanı. Posterior duvardan ayrılan kortike kemik parçası retropulsiyonu tanımlar. Lipomatozis yağ dansitesinde yumuşak dokudur; diskit disk aralığı ve son plakları etkiler; kord ödemi BT ile saptanmaz.

İlgili konular

• Epidural tümör yayılımı ve kord basısı
• Spinal epidural hematomun BT görünümü ve sınırı

Kaynaklar

Bu sayfadaki 40 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla otomatik olarak karşılaştırıldı; 20 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.