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Postoperatif orbita ve intraoküler materyal taklitçileri

Postoperative orbit and intraocular material mimics

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Postoperatif orbita ve intraoküler materyal taklitçileri: yayımlanmış olgu görüntüsü, koronal kesit

5 adım

Görüntü: Hellerhoff, “Augenlinsenersatz rechts in der Computertomografie 85M - CT axial”, Wikimedia Commons · CC BY-SA 4.0. Değişiklik: kırpıldı, yeniden boyutlandırıldı, odak işaretleri eklendi.

Özet

Retina dekolmanı cerrahisinde kullanılan silikon yağ ve çevresel bantlar travma BT'sinde kanamayla karışabilir; katarakt cerrahisi sonrası intraoküler lens BT'de yüksek atenüasyonlu görünür. BT, skleral çökertme materyallerinin ve vitreus içindeki gaz veya silikon yağ tamponadının görünümünü değerlendirmeye yardımcı olur; katarakt cerrahisi sonrası intraoküler lens yüksek atenüasyonlu izlenebilir. Bu materyalleri kanama sanmak gereksiz incelemeye yol açabilir; travmada BT'nin tüm açık glob yaralanmalarını saptayamayabileceği de göz önünde bulundurulmalıdır. İki globun dış konturunu ve cerrahi materyalin anatomik yerleşimini birlikte okuyarak yorumla.

Faz ve pencere

Kontrastsız tanısal
Skleral çökertme materyalleri göz duvarında indentasyon oluşturabilir; vitreus içindeki gaz BT'de hava atenüasyonunda, silikon yağı ise hiperatenuasyonlu görünür. Enükleasyon sonrası orbital protez kullanılabilir.

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

BT bulguları

  • Skleral çökertme bandı, glob duvarının dışından geçen ince çevresel kontur oluşturur ve komşu sklerada hafif içe çekilme yapabilir.
  • Vitreus boşluğunu dolduran silikon yağı belirgin hiperdens olabilir; dansiteyi karşı göz ve görüntü gürültüsüyle kıyasla.
  • Retina cerrahisi sonrası intravitreal gaz glob içinde keskin sınırlı, hava atenüasyonlu kabarcık veya hava-sıvı seviyesi biçimindedir.
  • Katarakt cerrahisinde doğal lensin yerinde ince, yüksek atenüasyonlu intraoküler lens görülür.
  • Enükleasyon sonrası orbital implant ve protez kullanılabilir.
  • İmplantın beklenen küresel yatağından yer değiştirmesi, çevre yumuşak dokuda yeni şişlik veya kemik duvarında eşlik eden değişiklik komplikasyon şüphesi doğurur.

Normalde

Ameliyatlı tarafı aynı aksiyel seviyedeki karşı tarafla karşılaştırırken bant materyalinin glob dışında kaldığını, silikon veya gazın vitreus sınırları içinde olduğunu ve enükleasyon tarafında doğal glob yerine implant bulunduğunu doğrula.

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 s0849; organ sınırları veri setinin otomatik segmentasyonundan, birleştirilerek sadeleştirildi. Görüntüler 2,5 mm kesit aralığına yeniden örneklendi.

Ayırıcı tanı

Vitreus hemorajisi
vitreus içi kanama yumuşak doku atenüasyonundadır; silikon yağı genellikle daha belirgin hiperdens olup ameliyatlı göz içinde düzgün yayılım gösterebilir.
Açık glob yaralanmasında BT'de glob kontur deformitesi veya duvar defekti, intraoküler kanama ve ön kamara derinliği değişikliği görülebilir; BT tek başına tüm olguları saptamayabilir.
İntraorbital yabancı cisimlerin BT görünümü farklılık gösterebilir; skleral çökertmede silikon elemanlar göz duvarında indentasyon oluşturur.
Katarakt cerrahisi sonrası doğal lensin yokluğu ve yüksek atenüasyonlu intraoküler lens konturu görülebilir.

Tuzaklar

  • Silikon yağı veya yoğun skleral çökertme bandı vitreus kanaması gibi okunabilir; materyalin glob içindeki/dışındaki yerleşimini ve çevresel bant geometrisini multiplanar kesitlerde izle.
  • Vitreus gazı travmatik intraoküler hava ile karışabilir; bilinen retina cerrahisi ve düzgün glob duvarı ameliyat sonrası tamponadı destekler, ancak travma varsa duvar bütünlüğünü ayrıca denetle.
  • Enükleasyon sonrası orbital protez kullanılabilir.

Kendini dene

  1. Retina ameliyatı öyküsü olan hastada vitreus yaygın hiperdens; glob duvarı düzgün, kontur korunmuş. En olası açıklama nedir?

    Cevabı göster

    Silikon yağı tamponadı. Ameliyat öyküsü ve bütünlüğü korunmuş küre içindeki belirgin hiperdens dolum silikon yağını destekler. BT’de lens dislokasyonu ve glob rüptürü gibi travmatik bulgular saptanabilir; retina dekolmanı cerrahisi sonrası vitreus içindeki gaz hava atenüasyonunda, silikon yağı ise hiperdens görünür.

  2. Retina dekolmanı ameliyatı öyküsü olan hastanın BT'sinde glob duvarında hafif indentasyon oluşturan çökertme materyali ve vitreusta hava atenüasyonlu kabarcıklar görülüyor. En olası açıklama nedir?

    Cevabı göster

    Skleral çökertme bandı ve gaz tamponadı. Skleral çökertme materyali göz duvarında indentasyon oluşturabilir; vitreus içindeki gaz BT'de hava atenüasyonunda görünür.

İlgili konular

Kaynaklar

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

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