Supratentoryal araknoid kist

Özet

Supratentoryal araknoid kistler çoğunlukla orta kafa çukuru ve Sylvian fissür çevresinde yerleşen, iyi sınırlı ekstraaksiyel BOS koleksiyonlarıdır. BT ve MR'de kist iyi sınırlı ve ekstraaksiyel görünür; BT'de dansitesi BOS ile aynıdır ve büyük kistler komşu beyin dokusuna bası yapabilir. Tipik ve küçük kistler sıklıkla tesadüfi bulgulardır; büyük kistlerde kitle etkisi veya hidrosefali bulunup bulunmadığı değerlendirilmelidir. Kist rüptürü veya kanaması akut belirtilere yol açabilir ve kistin tipik görüntüleme özelliklerini değiştirebilir.

Faz ve pencere

Kontrastsız tanısal

İyi sınırlı ekstraaksiyel lezyon beyin parankimine göre hipodens, genellikle BOS ile benzer atenüasyondadır; komşu temporal lob, Sylvian fissür ve ventriküllerde itilme görülebilir. Basit araknoid kist için kontrast fazı gerekmez.

Kemik algoritması tanısal

Orta kafa çukuru kistlerinde komşu kalvaryumda remodeling veya scalloping görülebilir; kemik penceresinde bu değişiklikleri araştırın.

BT bulguları

• Ekstraaksiyel, düzgün sınırlı BOS boşluğu — sıklıkla orta kafa çukuru/Sylvian fissür komşuluğunda; daha seyrek konveksite, suprasellar veya interhemisferik alanda.
• BOS benzeri hipodens atenüasyon — basit kistte iç yapı homojendir; kan veya protein içeriği yoğunluğu artırabilir.
• Temporal lob basısı — kist tarafındaki temporal kutup düzleşebilir ve parankim karşı tarafa doğru yer değiştirebilir.
• Sylvian fissürün genişlemesi — kistik alan fissürü izleyerek uzanabilir ve komşu frontal/parietal lobları etkileyebilir.
• Ventrikül veya orta hat yer değiştirmesi — büyük hacimli lezyonda lateral ventrikül basısı ve karşı yana kayma görülebilir.
• Kemik remodeling'i — komşu kalvaryumda remodeling veya scalloping görülebilir.
• Komplikasyon bulguları — kist içinde kanama veya komşu subdural koleksiyon gelişirse atenüasyon BOS'tan farklı hale gelebilir.

Ölçütler ve sınıflamalar

Galassi sınıflaması (orta kafa çukuru kistleri)

Normalde

Lezyon tarafındaki temporal lob hacmini, Sylvian fissür genişliğini, ventrikül şeklini ve sfenoid kanat konturunu karşı tarafın aynı seviyesinde kıyaslayın.

Ayırıcı tanı

Epidermoid kist

sisternal aralıklara uzanıp damar ve sinirleri sarabilir; BT dansitesi BOS'a yakın olsa da MR difüzyonda belirgin kısıtlanma ayırt ettirir.

Kistik neoplazi

mural nodül, solid komponent, ödem veya kontrastlanma araknoid kist için tipik değildir; kuşkuda MR değerlendirmesi gerekir.

Kronik subdural hematom

iç dansitesi sıklıkla BOS'tan yüksektir veya heterojendir, membran ve kitle etkisi eşlik edebilir; travma ve seri görüntüleme önemlidir.

Tuzaklar

• Kist içi kanama BOS atenüasyonunu ortadan kaldırabilir; yeni hiperdens bileşen veya çevresel subdural kanama varsa lezyonu komplike olarak tarif edin.
• Galassi sınıflaması bu kaynakta orta kafa çukuru araknoid kistleri için ele alınmıştır; suprasellar veya konveksite kistlerine uygulanabilirliği kaynaklarda gösterilmemiştir.

Kendini dene

1. İntrakraniyal araknoid kistlerin BT'deki tipik dansitesi nasıldır?

   • BOS ile izodens
   • BOS'tan belirgin hiperdens
   • BOS'tan belirgin hipodens
   • BT'de her zaman heterojen
   Cevabı göster

   BOS ile izodens. İntrakraniyal araknoid kistler BT'de BOS ile izodens görünür.

2. Galassi tipi, hangi yerleşimdeki araknoid kistlerin değerlendirilmesinde ele alınmıştır?

   • Orta kafa çukuru
   • Posterior fossa
   • İntraventriküler alan
   • Serebellopontin açı
   Cevabı göster

   Orta kafa çukuru. Kaynak, orta kafa çukuru araknoid kistlerinin klinik sonuçlarını değerlendirirken Galassi tipini de incelemiştir.

İlgili konular

• Posterior fossa araknoid kisti

Kaynaklar

Bu sayfadaki 30 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla otomatik olarak karşılaştırıldı; 7 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.