Litik, sklerotik ve mikst kemik metastazları

Özet

Metastatik meme kanserinin %65-75'inde ve ileri evre prostat kanserinin %80'inden fazlasında kemik metastazı görülür; ağrı ve patolojik kırıklar gibi iskelet ilişkili olaylara yol açar. BT kemik matriksini değerlendirmede tercih edilir; kemik iliğinin değerlendirilmesinde MRG en duyarlı görüntüleme yöntemidir. Litik, sklerotik ve mikst görünüm primer tümörün biyolojisiyle ilişkili olsa da tek başına tümör kökenini kanıtlamaz. Lezyonun yük taşıyan kemikte veya vertebrada oluşturduğu yapısal zayıflığı atlamak patolojik kırık ya da nörolojik komplikasyonun geç fark edilmesine yol açabilir.

Faz ve pencere

Kontrastsız tanısal

Kemik algoritmalı kontrastsız BT'de litik odak trabeküler yoğunluk kaybı ve düzensiz kemik yıkımı, sklerotik odak çevre medüller kemiğe göre artmış yoğunluk, mikst odak ise aynı lezyonda iki patern olarak izlenir. Kortikal kesinti ve kemik dışına uzanan yumuşak doku kitlesi yapısal yayılımı gösterir.

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

BT bulguları

• Litik metastazda medüller trabeküller seyrelir veya silinir; sınır çoğu kez coğrafi, güve yeniği ya da permeatif yıkım görünümündedir.
• Sklerotik metastaz, vertebra korpusu, kaburga veya pelvis medüllasında yamalı ya da birleşen kemik yoğunluğu artışı yapar.
• Mikst metastazda litik merkez ile çevresel veya odaksal osteoskleroz aynı kemik odağında birlikte bulunur.
• Kortikal incelme, oyulma ya da tam kat kesinti; lezyonun kemiğin mekanik kabuğunu zayıflattığını gösterir.
• Periost boyunca düzensiz yeni kemik ve kemik dışı yumuşak doku kitlesi, basit sklerotik odaktan daha agresif kemik tutulumunu düşündürür.
• Vertebral metastazlarda posterior duvar yıkımı patolojik kırıkla birlikte görülebilir; spinal instabilite ve metastatik spinal kord kompresyonu olası komplikasyonlardır.

Ölçütler ve sınıflamalar

BT morfolojisine göre kemik metastazı

Osteolitik patern kemik yıkımının baskın olduğu; osteoblastik/sklerotik patern yeni kemik yapımının baskın olduğu; mikst patern ise ikisinin aynı lezyonda birlikte izlendiği gruptur. Bu morfolojik ayrım primer tümörü tek başına belirlemez.

Normalde

Aynı seviyedeki normal vertebra korpusunda trabeküler ağ homojen dağılır, kortikal çevre kesintisizdir ve yükseklik korunur; normal iliak kanat ve kaburgada odaksal destrüksiyon ya da yamalı skleroz görülmez. Şüpheli odağı karşı tarafın eş kemik bölgesiyle kıyaslayarak medüller yoğunluk, kortikal kalınlık ve dış kontur farklılığını ayırt edin.

Ayırıcı tanı

Enostoz, vertebral kemik lezyonları arasında görülebilen benign lezyonlardan biridir.

Paget hastalığı

kemik genişlemesi, kortikal kalınlaşma ve kaba trabeküller odaksal metastazdan farklı bir yeniden yapılanma paterni oluşturur.

Osteoporotik vertebra kırığı

end-plaka kırığının varlığı temel göstergedir; deformite olmaksızın bile korteks kırığı görülebilir.

Osteomiyelit

spondilodiskitte enfeksiyon intervertebral diski ve komşu vertebraları tutar.

Benign kemik adacıklarıyla seyreden osteopoikiloz

özellikle periartiküler uzun kemik ve pelviste benzer boyutlu, düzenli dağılımlı sklerotik odaklar yapar.

Tuzaklar

• Tedavi sonrası skleroz, önceden bilinen litik metastazın iyileşme yanıtı olabilir; yeni bir sklerotik odak kararını önceki inceleme ve tümör yüküyle birlikte verin.
• Diğer görüntülemelerde şüpheli olup BT’de belirgin karşılığı görülmeyen kemik lezyonlarında, kemik iliği ödemi haritalaması patolojik alanı gösterebilir; bu nedenle BT’de belirgin odak görülmemesi kemik iliği tutulumunu kesin olarak dışlamaz.
• HU ölçümü litik ve sklerotik kemik lezyonlarını ayırt etmeye katkı sağlayabilir; lezyonun sınırı, dağılımı ve diğer görüntüleme özellikleri de değerlendirilmelidir.

Kendini dene

1. Akciğer kanserli hastanın femurunda trabeküllerin silindiği, düzensiz sınırlı medüller odak var. Patern hangisidir?

   • Osteolitik metastaz
   • Osteoblastik metastaz
   • Enkondrom
   • Fibröz displazi
   Cevabı göster

   Osteolitik metastaz. Medüller trabekül kaybı ve düzensiz destrüksiyon litik kemik yanıtını gösterir. Sklerotik metastaz yoğun kemik yapımıyla görünür; enkondromda kondroid matriks kalsifikasyonu, fibröz displazide ise buzlu cam matriksi beklenir.

2. Bir lezyonda aynı anda trabeküler kayıp ve düzensiz yoğun kemik adacıkları izleniyor. En uygun morfolojik tanım nedir?

   • Mikst metastatik patern
   • Kemik iliği infarktı
   • Osteoid osteoma
   • Kondrosarkom
   Cevabı göster

   Mikst metastatik patern. Aynı odağın içinde kemik yıkımı ve yeni kemik oluşumunun birlikte olması mikst metastatik paternle uyumludur. İnfarkt serpijinöz sınırlı skleroz yapar; osteoid osteom küçük nidus çevresinde reaktif sklerozla, kondrosarkom ise kıkırdak matriksi ve kortikal agresyonla tanınır.

Bu konunun yer aldığı turlar

• Onkolojik BT: evreleme ve yanıt değerlendirmesi

İlgili konular

• Metastatik epidural hastalık ve spinal kord basısı

Kaynaklar

Bu sayfadaki 38 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla otomatik olarak karşılaştırıldı; 6 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.