Tüberkülom

Özet

Tüberkülom, tüberküloz granülomlarının birleşmesiyle oluşan, çoğu kez iyi sınırlı ve kitleyi taklit edebilen parankimal nodüldür. İnce kesit BT, nodülün iç kalsifikasyonunu, çevresindeki küçük uydu odakları ve eşlik eden üst lob fibrozisi ya da bronkojenik yayılımı akciğer grafisinden daha iyi gösterir. Bu işaretler tüberküloz olasılığını artırsa da kanserden veya başka granülomatöz enfeksiyonlardan tek başına ayırmaz. Tümör sanılıp gereksiz girişime gidilmesi veya tümörün tüberkülom kabul edilip izlenmesi klinik açıdan önemli sonuç doğurabilir.

Faz ve pencere

Kontrastsız tanısal

İnce kesit akciğer BT'de yuvarlak, iyi sınırlı solid nodül/kitle, çevresindeki küçük uydu nodüller ve komşu parankimal skar/fibrotik bantlar değerlendirmeye alınır. Parankimal morfoloji kontrastsız BT’de değerlendirilebilir; kontrastlanma ölçümleri ayırıcı tanıya katkı sağlayabilse de BT bulguları tek başına tüberkülozu maligniteden kesin olarak ayıramaz.

Önerilen pencereler: Akciğer (G 1500 / M -600), Mediasten (G 350 / M 50).

BT bulguları

• İyi sınırlı yuvarlak nodül — tek veya birleşmiş çoklu granülomlardan oluşan kitle görünümü verebilir.
• Uydu nodüller — ana nodülün hemen çevresinde dağılmış küçük ayrı odaklar tüberküloz olasılığını yükseltir.
• İç kalsifikasyon — merkezî veya kaba kalsifik odak bulunabilir; yokluğu tüberkülomu dışlamaz.
• Bronkojenik yayılım — aynı lobda sentrilobüler dallanan nodüller ve tomurcuklanan ağaç aktif hava yolu yayılımını düşündürür.
• Üst lob fibrotik bantları — hacim kaybı ve çekintiyle birlikte eski ya da eşlik eden tüberküloz değişikliğini gösterebilir.
• Kavite veya hava boşluğu — bazı olgularda granülom nekrozu/aktif hastalıkla ilişkili olabilir; yalnız kavite görünümü etkene özgü değildir.
• Hiler-mediastinal lenf nodları — eşlik eden büyüme veya kalsifikasyon tüberküloz bağlamına katkıda bulunabilir.

Normalde

Normal akciğer penceresinde aynı lobun parankimi homojen havalıdır; pulmoner damarlar dallanır ve çevrelerinde ayrı yuvarlak nodül ya da dallanan sentrilobüler odak görülmez. Nodülün kenarını, çevresindeki uydu odakların dağılımını ve üst lob hacmini karşı tarafın aynı seviyesindeki akciğerle kıyaslayın.

Ayırıcı tanı

Primer akciğer karsinomu

spiküle/lobüle kenar, bronş tıkanması veya patolojik lenf nodu olabilir; uydu nodüller tüberkülozu destekler ama kesin ayırmaz.

Histoplazmoz veya başka granülom

kalsifiye nodül yapabilir; eşlik eden dağılım ve mikrobiyolojik/epidemiyolojik bağlam gerekir.

Hamartom

içindeki makroskopik yağ ve kaba 'patlamış mısır' kalsifikasyonu tanıyı destekler.

Metastaz

çoğunlukla çoklu, farklı boyutlarda ve rastgele dağılmış nodüller; tek baskın nodül çevresindeki uydu düzeni daha az tipiktir.

Akciğer apsesi

kalın duvarlı kavite, hava-sıvı seviyesi ve çevresel konsolidasyon gösterebilir; solid granülom morfolojisinden ayrılır.

Tuzaklar

• Uydu nodüller ve kalsifikasyon tüberküloza özgü değildir; nodülü yalnız bu işaretlerle kanser dışı ilan etmeyin.
• Kalsifikasyon saptanmaması tüberkülomu dışlamaz; birçok tüberkülom tamamen solid ve kalsifikasyonsuz olabilir.
• Kontrastlanma paterni farklı inflamasyon evrelerinde değişebilir ve maligniteyle örtüşebilir; etken tanısı olarak sunmayın.
• Eski fibrotik iz yanında yeni tomurcuklanan ağaç varsa tüm bulguları 'sekeller' diye geçiştirmeyin; aktif bronkojenik yayılım olasılığını ayrıca belirtin.

Kendini dene

1. Üst lobda iyi sınırlı bir nodülün hemen çevresinde küçük uydu nodüller görülüyor. Bu örüntü hangi tanıyı destekler?

   • Tüberkülom
   • Akciğer hamartomu
   • Pulmoner metastaz
   • Akciğer apsesi
   Cevabı göster

   Tüberkülom. Tüberküloma komşu küçük uydu nodüller görülebilir; postprimer tüberküloz üst lobları tercih eder. Bu bulgular tanıyı destekler ancak tek başına kesinleştirmez.

2. Nodülün BT'de kalsifiye olması hangi çıkarımı destekler?

   • Granülomatöz nodül olasılığı
   • Tüberkülozun kesin kanıtı
   • Malignite dışlandığı
   • Aktif yayılımın kanıtı
   Cevabı göster

   Granülomatöz nodül olasılığı. Kalsifikasyon granülomatöz süreç olasılığına katkı sağlar, ancak tüberküloza özgü değildir ve tek başına maligniteyi dışlamaz. Aktif yayılım için bronkojenik nodüller gibi ek bulgular ve klinik/mikrobiyoloji gerekir.

Kaynaklar

Bu sayfadaki 37 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla otomatik olarak karşılaştırıldı; 4 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.