Atipik pulmoner karsinoid BT bulguları

Özet

Atipik pulmoner karsinoid, tipik karsinoide göre daha yüksek dereceli ve nodal ya da uzak yayılım olasılığı daha fazla olan iyi diferansiye nöroendokrin akciğer tümörüdür. BT'de santral veya periferik yuvarlak ya da oval nodül görülebilir; santral lezyonlarda bronş tıkanmasına bağlı atelektazi, hava hapsi veya obstrüktif pnömoni izlenebilir. Düzgün ve hipervasküler görünüm daha düşük dereceli bir tümörü dışlamaz; metastatik istasyonları atlamak hastalığın anatomik kapsamını eksik bildirir.

Faz ve pencere

Venöz tanısal: Kontrastlı toraks BT'de santral veya periferik kitlenin kontrastlanması ve santral tümörlerde bronş tıkanmasına bağlı distal atelektazi, hava hapsi ya da obstrüktif pnömoni değerlendirilir. BT morfolojisi atipik alt tipi tek başına doğrulamaz.
Kontrastsız: Parankim nodülü yuvarlak veya oval, düzgün ya da lobüle sınırlı olabilir; kalsifikasyon nadirdir.

Önerilen pencereler: Akciğer (G 1500 / M -600), Mediasten (G 350 / M 50), Kemik (G 1800 / M 400), Yumuşak doku (G 400 / M 40).

BT bulguları

Santral veya periferik yumuşak doku kitlesi — bronş içinden büyüyen odak ya da periferik, yuvarlak/lobüle parankim nodülü görülebilir.
Pulmoner karsinoidler iyotlu kontrast sonrası sıklıkla belirgin ve homojen kontrastlanır; kalsifikasyon nadirdir.
Bronş lümenine uzanım — endobronşiyal bileşen lümeni daraltır; aynı bronşun distalinde hava hapsi, mukus veya hacim kaybı gelişebilir.
Düzensiz kontur — bazı atipik tümörler daha lobüle, daha büyük veya heterojen görünür; bu morfoloji tek başına tipik-alt tip ayrımı yapmaz.
Hiler ve mediastinal nodlar — tümöre komşu reaktif nodlarla olası metastatik nodlar boyut, şekil ve istasyonlarıyla kaydedilir.
Uzak odaklar — görüntü alanındaki karaciğer ve kemiklerde metastaz açısından kuşkulu odaklar gözden geçirilir.
Eşlik eden distal hastalık — obstrüktif pnömoni, atelektazi, bronşektazi veya akciğer apsesi tümörün beslediği bronş dağılımında yer alabilir.

Ölçütler ve sınıflamalar

Atipik karsinoid histolojik mitoz aralığı: 2–10 mitoz / 2 mm²
Atipik karsinoidde fokal nekroz: Mitoz sayısından bağımsız olarak bulunması sınıflamayı destekler
WHO pulmoner karsinoid histolojik sınıflaması: Atipik karsinoid, mitotik aktivitenin tipik karsinoid sınırını aşması veya odaksal nekroz görülmesiyle tanımlanan orta dereceli karsinoiddir. Görüntülemede karsinoidler santral veya periferik yerleşimli nodüller olarak görülebilir; tipik ve atipik alt tiplerin doğru sınıflandırılması patolojik incelemeyi gerektirir.

Normalde

Santral tümörlerde bronş tıkanıklığına bağlı distal atelektazi veya hava hapsi görülebilir.

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 s1278; organ sınırları veri setinin otomatik segmentasyonundan, birleştirilerek sadeleştirildi. Görüntüler 2,5 mm kesit aralığına yeniden örneklendi.

Ayırıcı tanı

Tipik pulmoner karsinoid: daha düzgün ve homojen kontrastlanan kitleyle görülebilir, ancak BT morfolojisi iki histolojik alt tipi güvenilir biçimde ayıramaz.
Küçük hücreli akciğer kanseri: agresif seyirli ve erken metastaz yapabilen bir akciğer nöroendokrin karsinomudur; kesin sınıflama doku bulgularına dayanır.
Büyük hücreli nöroendokrin karsinom: pulmoner karsinoidden ayrı, daha agresif bir akciğer nöroendokrin tümörüdür; kesin sınıflama doku incelemesine dayanır.
Skuamöz hücreli karsinom: pulmoner karsinoidlerin radyolojik özellikleri skuamöz hücreli karsinom gibi diğer primer akciğer maligniteleriyle örtüşebilir.

Tuzaklar

Pulmoner karsinoidler düzgün veya lobüle sınırlı ve belirgin kontrastlanan nodüller olabilir; BT özellikleri tipik ve atipik alt tipleri güvenilir biçimde ayırt ettirmez.
Enfeksiyöz granülomatöz hastalıklar, özellikle tüberküloz, mediastinal lenfadenopatiyle birlikte torasik metastazları taklit edebilir.
BT'de nekroz görülmemesi tipik karsinoidi kanıtlamaz; atipik karsinoid histolojisinde fokal nekroz görülebilir ve küçük biyopsi örneklerinde alt tip ayrımı güçleşebilir.
Santral tümörlerde bronş tıkanmasına bağlı distal atelektazi görülebilir; BT'de bronş tıkanıklığının distalindeki bulguları değerlendirin.

Kendini dene

Periferik lobüle kitle ve mediastinal nodlar saptandı; histolojik alt tip soruluyor. BT ile en doğru yaklaşım?
Cevabı göster
Alt tip için histoloji gerekir. Atipik karsinoid periferik ve lobüle olabilir; ancak BT görünümü tipik ve atipik karsinoidi güvenilir biçimde ayıramaz. Mitotik aktivite ve nekroz doku örneğinde değerlendirilmelidir.
Santral kitle bronşu daraltmış; distal lobda atelektazi ve hiler nod var. Nodal değerlendirmeyi tamamlamak için özellikle ne yapılmalıdır?
Cevabı göster
Diğer nodal istasyonlar. Pulmoner karsinoidlerde nodal ve uzak metastazların evrelemede değerlendirilmesi önemlidir; kaynak, preoperatif nodal ve uzak metastaz değerlendirmesinde SRS ile torasik SPECT/BT'nin yararlı olabileceğini belirtir. Bu senaryoda, hiler nodun yanı sıra diğer mediastinal nodal istasyonların da değerlendirilmesi gerekir.

İlgili konular

Kaynaklar

Bu sayfadaki 41 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla otomatik olarak karşılaştırıldı; 24 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.