Atrofiye bağlı geniş ekstraaksiyel BOS alanı BT bulguları

Özet

Serebral hacim kaybında kortikal sulkuslar ve subaraknoid BOS aralıkları yaygın genişler; bu görünüm subdural koleksiyonla karışabilir. Kontrastsız BT’de sulkusların belirgin genişlemesi ve parankim hacim kaybı, atrofi lehine yorumlanır; kitle etkisi bulunmaması bu görünümü destekler. Kortikal ven ve antikortikal ven işaretleri MR’da, kortikal atrofi zeminindeki subdural higromanın ayırıcı tanısı bağlamında bildirilmiştir. Atrofiye bağlı genişlemiş BOS aralığının subdural koleksiyon olarak yanlış yorumlanması yanlış pozitife; gerçek bir subdural koleksiyonu yalnızca atrofi sanmak ise kitle etkisinin ve tedavi ihtiyacının kaçırılmasına yol açar.

Faz ve pencere

Kontrastsız tanısal: Kontrastsız BT’de geniş sulkuslar ve konveksite boyunca BOS aralıkları değerlendirilir; yaygın parankim hacim kaybının varlığı ile fokal kitle basısının bulunmaması atrofi lehine yorumlanır. Kortikal ve antikortikal ven işaretleri MR’da bildirilmiştir. Kontrastsız BT yeterli olup; parankim hacmi, sulkuslar ve ventrikül boyutları birlikte değerlendirilebilir.

Önerilen pencereler: Beyin (G 80 / M 40), Subdural (G 200 / M 75).

BT bulguları

Sulkus genişlemesi — frontal, parietal veya temporal korteks olukları kalvaryuma doğru belirginleşir ve birbirinden ayrılır.
Subaraknoid BOS devamlılığı — konveksitedeki sıvı aralığı kortikal sulkusların içine kesintisiz uzanır.
Kortikal ven işareti (MR) — kortikal ven bulgusu, atrofi ile subdural koleksiyon ayrımında MR’da bildirilmiştir.
Parankim hacim azalması — giruslar incelmiş ve aralarındaki sulkal boşluklar yaygın genişlemiştir.
Lateral ve üçüncü ventriküllerin genişlemesi, parankim hacim kaybına (atrofi) bağlı ex vacuo değişimi yansıtabilir; tek başına hidrosefali veya BOS akış bozukluğu anlamına gelmez.
Kitle etkisinin olmaması — korteks içe itilmez, sulkuslar koleksiyon altında silinmez ve orta hat yapıları basıyla yer değiştirmez.
Yaygın veya bölgesel dağılım — geniş BOS aralıkları birden çok lobda hacim kaybıyla uyumlu örüntü gösterir, tek hilal koleksiyona sınırlı kalmaz.

Normalde

Normal yaş ve anatomiye uygun BT’de konveksite sulkusları ince BOS çizgileri şeklindedir ve giruslar kalvaryuma daha yakın durur. Kıyaslarken yaygın sulkus genişliğini, parankim hacmini ve ventrikül genişlemesinin sulkuslarla uyumunu değerlendirin; ventriküler boyutlardaki artışın atrofya mı yoksa BOS akış dinamiklerindeki değişikliğe mi dayandığı birlikte incelenir.

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

Subdural higroma: fokal koleksiyon oluşturarak korteksi içe itebilir ve alttaki sulkusları daraltabilir; kitle etkisi ve orta hat kayması ayırıcı tanıda önemlidir.
Kronik subdural hematom: iç yapı heterojen veya bölmeli olabilir; koleksiyon beyin yüzeyini basıyla yer değiştirebilir.
Beyin atrofisi olmayan hidrosefali: ventriküller orantısız genişlerken konveksite sulkusları silikleşebilir; sulkuslar yaygın genişlemiş olmaz.
Genişlemiş subaraknoid alan: BOS aralığı ve damarlar kortikal yüzeyin dış konturunu izler; beyin hacminin genel görünümü ile birlikte yorumlanır.

Tuzaklar

BOS yoğunluklu aralığın hilal biçimli görünmesi tek başına subdural yerleşimi kanıtlamaz; sulkuslarla devamlılığı ve içindeki damarları izleyin.
Ventrikül genişliğini tek başına hidrosefali kabul etmeyin; kortikal sulkusların da geniş olup olmadığını ve parankim hacmini karşılaştırın.
Kortikal ven işareti MR’da bildirilmiştir; kortikal ve antikortikal ven bulgularının birlikte görülmesi atrofi ile subdural koleksiyon ayrımını güçleştirebilir.

Kendini dene

Konveksitede BOS aralıkları yaygın geniş, kortikal sulkuslar bu aralıklarla devamlı ve belirgin fokal bası yok.
Cevabı göster
Kortikal atrofi. Yaygın sulkus genişlemesi ve fokal kortikal bası olmaması, BOS aralıklarının hacim kaybına (atrofi) bağlı olduğunu destekler; kitle etkisi veya altta yatan sulkusların basılması yoktur.
Genişlemiş lateral ventriküller ve yaygın sulkus genişlemesi birlikte görüldüğünde bu bulgu en çok aşağıdakilerden hangisiyle ilişkilidir?
Cevabı göster
Beyin atrofisi (ex vacuo ventrikülomejali). Sulkusların da geniş olması ve parankim hacim kaybı ventrikül genişlemesinin ex vacuo olabileceğini destekler. Hidrosefalide ventrikül genişlemesine sulkus basısı eşlik edebilir; kanama ve kitle için BT'de ayrı intraventriküler veya fokal bulgu aranır.

Bu konunun yer aldığı turlar

Kafa travması ve intrakraniyal kanama

Kaynaklar

Bu sayfadaki 33 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla tek tek karşılaştırıldı; 12 cümle bu karşılaştırmada düzeltildi (2026-10-09).

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