Lateral ventrikül asimetrisi BT bulguları

Özet

Lateral ventriküllerin boyut ve boynuz şekilleri bireyler arasında değişebilir; normal boyutlu ventriküllerde hafif sağ-sol farkı tek başına hastalık anlamına gelmez. Kontrastsız BT, frontal boynuzlardan atrium ve oksipital boynuzlara kadar asimetrinin dağılımını, orta hat yapılarının konumunu ve çevre parankimi gösterir. Asimetriyi benign varyant saymadan önce foramen Monro tıkanıklığı, intraventriküler lezyon, tek taraflı hidrosefali ve karşı hemisferde eski doku kaybı araştırılmalıdır. Foramen Monro’daki intraventriküler kist, lateral ventriküllerde asimetrik genişlemeye ve obstrüktif hidrosefaliye yol açabilir.

Faz ve pencere

Kontrastsız tanısal: Aksiyel ve koronal rekonstrüksiyonlarda lateral ventriküllerin ön boynuz, gövde, atrium ve oksipital boynuzları karşılaştırılır; asimetri tek başına kontrastlanma gerektiren bir bulgu değildir. Aynı incelemede üçüncü ventrikül, foramen Monro komşuluğu, septum pellucidum, orta hat ve periventriküler parankim değerlendirilir.

Önerilen pencereler: Beyin (G 80 / M 40).

BT bulguları

Bölgesel boyut farkı — asimetri yalnız frontal boynuzlarda, atriumda veya değişken şekilli oksipital boynuzlarda baskın olabilir.
Karşı hemisferle hacim ilişkisi — geniş görünen ventrikül çevresindeki sulkus ve parankim hacmi, bası ile ex vacuo genişlemeyi ayırmaya yardım eder.
Septum pellucidum konumu — orta hatta kalması ve belirgin bombeleşmemesi, kitle etkisiz asimetriyi destekler.
Foramen Monro açıklığı — tek ventrikül genişlemesinde ipsilateral Monro düzeyinde kitle veya çıkış tıkanıklığı araştırılır.
İnme sonrası gliozis ipsilateral lateral ventrikülde genişlemeye yol açabilir; her iki foramen Monro’nun tıkanması ise simetrik iki lateral ventrikül hidrosefalisiyle sonuçlanabilir.
Periventriküler interstisyel ödem — ventrikül çevresindeki ödem, obstrüktif hidrosefaliye eşlik edebilir.
Eski parankimal kayıp — çevre hemisferde ensefalomalazi ve sulkal genişleme, ventrikülün doku kaybına bağlı çekilmesini açıklar.
Önceki görüntüyle stabilite — aynı anatomik şeklin uzun dönem korunması, yeni obstrüksiyondan çok varyant lehinedir.

Normalde

Normalde iki lateral ventrikülün frontal boynuzları, gövdeleri ve atriumları birbirine yakın boyutta olabilir; oksipital boynuz uzunluğu ve konturu doğal olarak değişkendir. Özellikle oksipital boynuzların şekil ve uzunluğunun bireyler ve iki taraf arasında değişebileceğini göz önünde bulundurun.

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 s0103; organ sınırları veri setinin otomatik segmentasyonundan, birleştirilerek sadeleştirildi. Görüntüler 2,5 mm kesit aralığına yeniden örneklendi.

Ayırıcı tanı

Foramen Monro obstrüksiyonu: tek taraflı ventrikül genişlemesi, ilgili foramen düzeyinde kitle, membran veya ependimal yapışıklıkla birlikte olabilir.
İntraventriküler kitle: ventrikül içinde yumuşak doku veya kalsifik odak ve komşu lümende şekil bozulması yapabilir.
Obstrüktif hidrosefali: ventrikül genişlemesine periventriküler hipodens ödem, sulkus basılanması veya orta hat etkisi eşlik edebilir.
Ex vacuo ventrikül genişlemesini değerlendirirken hemisferik atrofi ve belirgin kortikal sulkusları arayın.
Eski doku kaybı sonucu oluşan porensefalik kavite genellikle ensefalomalazi ile ilişkilidir; nadiren de olsa kütle etkisi yaratarak foramen Monro obstrüksiyonu ve hidrosefale neden olabilir.

Tuzaklar

Oksipital boynuzların eşit uzunlukta olmasını beklemeyin; bu bölümün konturu ve uzunluğu ventrikül asimetrisinin sık kaynağıdır.
Tek taraflı genişliği varyant kabul etmeden önce foramen Monro'yu ve karşılaştırmalı üçüncü ventrikül boyutunu izleyin; fokal çıkış tıkanıklığı belirgin orta hat kayması olmadan da olabilir.
Septum pellucidumun hafif eğimini tek başına kitle etkisi saymayın; ventrikül duvarında bası, parankim ödemi ve önceki görüntüde değişim arayın.
Geniş ventrikülü atrofik genişleme diye yorumlamadan sulkusları ve ilgili hemisfer hacmini kontrol edin; sulkusların silinmesi bası lehine, genişlemesi hacim kaybı lehinedir.

Kendini dene

Baş ağrısı nedeniyle çekilen kontrastsız BT'de sol lateral ventrikül biraz geniş; septum orta hatta, sulkuslar açık ve ödem yok. En uygun yorum nedir?
Cevabı göster
Olası anatomik asimetri. Bu bulgular tek başına olası anatomik asimetriyle uyumludur. Bir çalışmada asimetrik lateral ventriküller tesadüfi bulgular arasında yer almış ve bu bulgular için ek yönlendirme gerekmemiştir.
Foramen Monro düzeyindeki intraventriküler kist, lateral ventriküllerde hangi soruna yol açabilir?
Cevabı göster
BOS akımının tıkanmasına bağlı obstrüktif hidrosefali. Foramen Monro'daki intraventriküler kist BOS akımını engelleyerek asimetrik lateral ventrikül genişlemesine ve obstrüktif hidrosefaliye yol açabilir.

İlgili konular

Kaynaklar

Bu sayfadaki 37 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla tek tek karşılaştırıldı; 6 cümle bu karşılaştırmada düzeltildi (2026-10-09).

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