Santral dev hücreli granülom

Özet

Santral dev hücreli granülom çoğunlukla genç erişkinlerde görülen, mandibula ön bölümünü ve bazen orta hattı aşan intraosseöz bir lezyondur. CBCT, lezyonun tek ya da çok odacıklı yapısını, kortikal genişleme veya perforasyonu ve çevre dokularla ilişkisini değerlendirmede etkilidir; tanı klinik, görüntüleme ve histopatolojik bulgularla birlikte konmalıdır. Agresif varyantlar hızlı büyüme, ağrı, kök rezorpsiyonu, kortikal genişleme veya erizyonu ve nüks eğilimi gösterebilir. CBCT, lezyonun yayılımı, iç mimarisi ve kortekse tutulumunun değerlendirilmesinde etkilidir; kortikal erizyon ve kök rezorpsiyonu sıklıkla izlenir.

Faz ve pencere

Kontrastsız tanısal

Kontrastsız BT'de litik, genişleyici kitle, iç septalar veya trabeküller ve kortikal incelme/erizyon izlenebilir. Bu kemik lezyonunun değerlendirilmesi için kontrast fazı gerekmez.

Kemik algoritması tanısal

Aksiyel, koronal ve sagittal kemik rekonstrüksiyonları lezyon sınırını, ince kalan korteksi, perforasyon alanlarını, trabeküler septaları ve komşu diş köklerinin yer değiştirmesi ya da rezorpsiyonunu ortaya koyar.

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

BT bulguları

• Ön mandibulada simfiz veya parasimfizden başlayıp orta hattı geçebilen intraosseöz litik lezyon.
• İç yapısı tek odacıklı olabileceği gibi, ince kemik septalarıyla çok odacıklı görünüm de alabilir.
• Ekspansiyon mandibulada bukkal ve lingual korteksi inceltir; ileri lezyonda kortikal bütünlük bozulabilir.
• Komşu diş köklerinde rezorpsiyon görülebilir; bu özellik agresif lezyonlarla daha sık ilişkilendirilir.
• Lezyonun sınırı iyi seçilebileceği gibi agresif olgularda daha az belirgin ve destrüktif olabilir.
• Maksillada lezyonun sinüs tabanı, burun tabanı ve komşu alveoler çıkıntıya uzanımı çok düzlemli görüntülerde haritalanır.
• Yumuşak dokuya taşan bölüm kortikal açıklıktan devam edebilir; tek başına genişleme yumuşak doku yayılımı anlamına gelmez.

Ölçütler ve sınıflamalar

Lokal agresif davranış gösterebilen santral dev hücreli granülom

Agresif varyantlar hızlı büyüme, kortikal genişleme, ağrı, kök rezorpsiyonu ve nüks eğilimi gösterebilir; histopatolojik olarak agresif olgularda dev hücre sayısı ve inflamatuvar infiltrasyonda hafif artış eğilimi görülebilir. BT bu özellikleri gösterir, ancak alt tip kararı klinik ve histopatolojik bilgilerle verilir.

Normalde

Normal ön mandibulada korteks kesintisizdir; trabeküler kemik, simfiz boyunca düzenli yoğunlukta izlenir ve diş köklerinin lamina durası korunur. Koronal ve sagittal çok düzlemli rekonstrüksiyonlar ile 3D görüntüleme, lezyonun yayılımını, iç mimarisini ve kortikal tutulumunu değerlendirerek gerçek ekspansiyonun saptanmasında etkilidir.

Ayırıcı tanı

Odontojenik keratokist

mandibula arka bölümünde ve ramusta daha sık uzanır; belirgin bukkal-lingual ekspansiyon çoğu olguda sınırlıdır.

Ameloblastom

özellikle mandibula arka gövde ve ramusta ekspansil multiloküler görünüm ve kök rezorpsiyonu yapabilir.

Anevrizmal kemik kisti

ekspansil septalı lezyon olabilir; sıvı-sıvı seviyeleri MR'da daha iyi seçilir ve BT görünümü tek başına özgül değildir.

Hiperparatiroidizme bağlı kahverengi tümör

dev hücreli granülomu taklit edebilir; çoklu kemik lezyonları ve biyokimyasal bağlam ayrımda önemlidir.

Glandüler odontojenik kist

ön mandibulada orta hattı aşan ekspansil görünüm oluşturabilir; görüntüleme ile santral dev hücreli granülomdan kesin ayrım yapılamaz.

Tuzaklar

• Orta hattı geçmesini tek başına tanı koydurucu sayma; bu özellik tanıya destek olur ama vakaların tümünde bulunmaz.
• Santral dev hücreli granülomlar ince iç septalar nedeniyle çok odacıklı (petek benzeri) görünebilir; bu septasyonlar lezyonun tipik radyografik özelliğidir ve tek başına agresif davranış anlamına gelmez.
• Diş kökü rezorpsiyonunu tek aksiyel kesitte arama; kök konturunu koronal ve sagittal rekonstrüksiyonlarda izleyerek doğrula.
• Ön çene lezyonunu radyolojik olarak kahverengi tümör ve diğer dev hücreli lezyonlardan kesin ayırma; laboratuvar ve doku tanısı gerekebilir.

Kendini dene

1. Genç erişkinde ön mandibulada orta hattı aşan ekspansil litik lezyon, ince septalar ve kortikal incelme var. En olası tanı hangisidir?

   • Santral dev hücreli granülom
   • Ameloblastom
   • Odontojenik keratokist
   • Periapikal semento-osseöz displazi
   Cevabı göster

   Santral dev hücreli granülom. Ön mandibula yerleşimi ve orta hattı aşabilen ekspansil litik görünüm santral dev hücreli granülomu destekler. Odontojenik keratokist çoğunlukla mandibulanın arka gövdesi veya ramusunda, ameloblastom ise en sık posterior mandibulada görülür.

2. Ön çenede dev hücreli granülom benzeri BT görünümü olan hastada hangi taklitçi laboratuvar bağlamıyla ayrılır?

   • Hiperparatiroidi kahverengi tümörü
   • Nazolabiyal kist
   • Dişlenme kisti
   • Fibröz displazi
   Cevabı göster

   Hiperparatiroidi kahverengi tümörü. Hiperparatiroidizmdeki kahverengi tümör, çenede santral dev hücreli granüloma benzeyen litik lezyon yapabilir; kalsiyum ve parathormon bağlamı ayrımda yardımcıdır. Radyolojik ve histopatolojik incelemeler tek başına tanıyı belirlemek için yeterli değildir; ayırım için biyokimyasal testler gerekir.

İlgili konular

• Glandüler odontojenik kist

Kaynaklar

Bu sayfadaki 40 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla tek tek karşılaştırıldı; 8 cümle bu karşılaştırmada düzeltildi (2026-10-08).

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Eğitim amaçlıdır; hasta başında tanı ve tedavi kararının yerine geçmez. İçerik yapay zekâ destekli bir süreçle güncel literatüre göre cümle cümle kaynaklarla karşılaştırıldı, ancak uzman radyolog incelemesinden geçmedi. Klinik kararlarda güncel kılavuzları, kurum protokollerini ve radyoloji raporunu esas alın.