Kronik sinüs osteiti

Özet

Kronik rinosinüzit osteiti, uzun süreli mukozal hastalıkla ilişkili kemik yeniden yapılanması ve yeni kemik oluşumudur; BT’de en sık kalınlaşma ve skleroz şeklinde fark edilir. Kontrastsız ince kesit sinüs BT, hem kemik değişikliğini hem eşlik eden mukozal opasifikasyon ve drenaj yolu hastalığını birlikte gösterir. Kalın ve sklerotik duvar kronik hastalık yükünü destekler, ancak tek başına aktif enfeksiyonu veya belirli bir etkeni kanıtlamaz. Düzgün remodelingin destrüktif enfeksiyon ya da kitle gibi yorumlanması yanlış yönlendirebilir; fokal kortikal yıkım varsa yalnız kronik osteite bağlanmamalıdır.

Faz ve pencere

Kontrastsız tanısal

Kemik algoritmalı sinüs BT’de özellikle maksiller ve sfenoid sinüs duvarlarında kalınlaşma, skleroz ve trabeküler yeniden yapılanma; yumuşak doku penceresinde eşlik eden mukozal opasifikasyon görülür. Osteit tanımı için kontrastlı faz gerekli değildir.

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

BT bulguları

• Maksiller sinüs ön veya arka duvarında düzgün kalınlaşma ve artmış kemik yoğunluğu.
• Sfenoid sinüs duvarında sklerotik yeniden yapılanma; kemik konturunun bütünlüğünün korunması.
• Etmoid septalarda kronik kalınlaşma veya düzensiz yeniden şekillenme; ince lamellerde eşlik eden incelme de olabilir.
• Aynı sinüste mukozal kalınlaşma ya da kısmi opasifikasyonla birlikte kemik duvarı değişikliği.
• Birden fazla sinüs duvarında yaygın tutulum ve kronik drenaj yolu daralması.
• Yumuşak doku kitlesi, agresif periostal reaksiyon veya fokal korteks kesintisinin bulunmaması, kronik remodeling lehinedir.

Normalde

Normal maksiller ve sfenoid sinüs duvarları ince, düzgün ve kortikal sınırları belirgindir; sinüs içi hava korunur. Aynı kesitte kontralateral sinüs duvarının kalınlığını ve yoğunluğunu kıyaslayıp kemik değişikliğinin mukozal hastalıkla aynı sinüste örtüşüp örtüşmediğine bakın.

Ayırıcı tanı

Akut osteomiyelit

kortikal destrüksiyon, periostal reaksiyon veya sinüs dışına uzanan inflamatuvar yumuşak doku görülebilir.

Fibröz displazi

kemik segmentini genişleten buzlu cam matriksli medüller lezyon yapar; izole duvar kalınlaşması değildir.

Ossifiye fibrom

keskin sınırlı, ekspansil ve yoğunluk değişkenliği gösteren odak olarak normal kemikten ayrılır.

Paget hastalığı

daha yaygın kraniofasiyal kemik kalınlaşması ve kaba trabeküler yapı oluşturabilir.

Mukosel

sinüs boşluğunu genişletip duvarı inceltebilir veya düzgünce yeniden şekillendirebilir; sklerotik duvar kalınlaşması temel bulgu değildir.

Tuzaklar

• Sinüs duvarı kalınlığını tek başına kronik rinosinüzit kanıtı saymayın; normal ve az hastalıklı etmoidlerde de kemik değişiklikleri görülebilir.
• Etmoid kemik lamelleri ince olduğundan remodelingi osteit sanmak kolaydır; kalınlaşma ve sklerozu özellikle maksiller veya sfenoid duvarla birlikte değerlendirin.
• Düzgün sklerozu agresif kemik yıkımıyla eşitlemeyin; korteks devamlılığı ve sinüs dışı yumuşak doku yayılımı ayrı bulgulardır.

Kendini dene

1. Uzun süreli sinonazal yakınmaları olan kişide maksiller sinüs opasifikasyonuna eşlik eden düzgün duvar kalınlaşması ve skleroz görülüyor. En uygun tanımlama nedir?

   • Kronik sinüs osteiti
   • Akut destrüktif osteomiyelit
   • Fibröz displazi
   • Maksiller mukosel
   Cevabı göster

   Kronik sinüs osteiti. Kronik mukozal hastalıkla birlikte düzgün kalınlaşma ve skleroz osteitik yeniden yapılanmayı destekler. Akut osteomiyelitte destrüksiyon veya ekstrasinüs inflamasyon aranır; fibröz displazi kemiği genişletir, mukosel sinüs boşluğunu ekspande eder.

2. Kronik sinüs osteitini destrüktif kemik enfeksiyonundan ayırmada en yararlı BT özelliği hangisidir?

   • Kortikal çizginin devamlılığı
   • Burun konkalarının sayısı
   • Nazolakrimal kanal yönü
   • Sfenoid sinüs hava hücresi
   Cevabı göster

   Kortikal çizginin devamlılığı. Düzgün remodelingde korteks genellikle izlenebilir ve kesintisizdir; destrüktif enfeksiyon fokal kortikal kayıp ve sinüs dışı inflamatuvar değişiklik yapabilir.

İlgili konular

• Frontal osteomiyelit ve Pott puffy tümörü
• Sinonazal fibroz displazi

Kaynaklar

Bu sayfadaki 33 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla tek tek karşılaştırıldı; 2 cümle bu karşılaştırmada düzeltildi (2026-10-08).

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