İntraduktal tübülopapiller neoplazm (ITPN)

Özet

ITPN, pankreas kanalının içinden büyüyen, belirgin müsin üretimi göstermeyen nadir bir intraduktal neoplazmdır ve sıklıkla invaziv karsinom bileşeni taşıyabilir. Çok fazlı kontrastlı BT, kanal içindeki solid dokuyu, kanal genişlemesini ve çevre parankimle ilişkisini göstererek duktal adenokarsinom ve IPMN'den ayrım için ipucu sağlar. İyi sınırlı, solid ve görece daha az hipovasküler görünüm tanıyı akla getirebilir; görüntüleme tek başına histolojik tanı koydurmaz. İntraduktal büyüme yalnız sıradan bir kistik kanal genişlemesi sanılırsa biyolojik açıdan önemli solid tümör bileşeni gözden kaçabilir.

Faz ve pencere

Arteriyel tanısal

Ana kanal içindeki solid komponent genellikle komşu pankreas parankimine göre izodens veya hafif hipodensdir ve arteriyel/portal fazlarda PDAC'ye kıyasla daha yüksek atenüasyon gösterir, ancak yine de parankimden daha az kontrastlanır.

Portal tanısal

Segmental kanal genişlemesi içinde solid intraduktal komponent, iyi sınırlı kitle konturu ve çevre parankimde invazyon/atrofi değerlendirilir; portal faz aynı zamanda bölgesel yayılımı gösterir.

Önerilen pencereler: Batın (G 400 / M 50), Yumuşak doku (G 400 / M 40).

BT bulguları

• Ana pankreatik kanal lümenini dolduran solid, tübülopapiller yumuşak doku
• Tümörün önünde veya arkasında segmental ana kanal genişlemesi; kanal içinde sıvı ile solid doku birlikteliği
• İntraduktal solid doku çevresinde düşük atenüasyonlu pankreatik sıvı ve iki tonlu kanal görünümü
• Kitle sınırlarının klasik duktal adenokarsinoma göre daha iyi seçilebilmesi; bu özellik olgular arasında değişir
• Arteriyel ve portal fazda solid komponentin kontrastlanması; kontrastlanma derecesinin tanısal olarak tek başına belirleyici olmaması
• Ana kanal genişlemesi ve lezyonun distalinde parankim atrofisi
• Kitle çevresi yağ planlarında infiltrasyon, damar teması veya lenf düğümü; invaziv bileşen şüphesinde ayrıca aranır

Normalde

Normal ana pankreatik kanal ince ve kesintisiz seyreder; lümeni içinde ayrı yumuşak doku bulunmaz ve kanalın iki yanındaki pankreas parankimi benzer kontur ve kontrastlanma gösterir. Aynı düzeyde kanal çapını, lümen içindeki solid odağı ve tümör çevresindeki pankreas sınırlarını kıyaslayarak intraduktal büyümeyi parankim kökenli kitle etkisinden ayır.

Ayırıcı tanı

İntraduktal papiller müsinöz neoplazm (IPMN)

kanal genişlemesine eşlik eden müsin, kistik yan dallar veya mural nodül olabilir; ITPN'nin baskın özelliği solid kanal içi tümör dokusudur.

Pankreatik duktal adenokarsinom

çoğunlukla infiltratif hipovasküler parankim kitlesi, kanal kesilmesi ve distal atrofi yapar; intraduktal dolum paterni daha az tipiktir.

Pankreatik nöroendokrin tümör

çoğu iyi sınırlı ve belirgin arteriyel kontrastlanan parankim kitlesidir; ana kanal lümenini uzun segment doldurması beklenmez.

Kanal taşı/debris

yüksek dansiteli taş veya değişken yoğunluklu materyal kanal genişlemesine yol açabilir, fakat kontrastlanan solid doku kitlesi oluşturmaz.

Solid psödopapiller neoplazm

genellikle parankim merkezli solid-kistik kitle ve kanama/nekroz alanları gösterir; ana kanal içinde büyüme temel görünüm değildir.

Tuzaklar

• ITPN'nin kontrastlanması her olguda aynı değildir; kaynak serilerde arteriyel/venöz atenüasyon farklılıkları bildirilmiştir, bu nedenle tek fazdaki hipodensite tanıyı dışlamaz.
• Kanal içindeki düşük atenüasyonlu sıvı ile solid tümör aynı genişlemiş lümende birlikte bulunabilir; yalnız kistik bileşeni ölçmek intraduktal kitleyi kaçırır.
• İyi sınırlı görünüm invazyon olmadığını garanti etmez; çevre yağ planı, damarlar ve bölgesel lenf düğümleri ayrıca değerlendirilmelidir.
• ITPN nadirdir ve görüntülemede PDAC veya IPMN olarak yanlış adlandırılabilir; kesin alt tip histopatolojiyle belirlenir.

Kendini dene

1. Genişlemiş ana pankreatik kanal içinde solid doku ve çevresinde sıvı izleniyor; kitle görece iyi sınırlı. En olası lezyon nedir?

   • İntraduktal tübülopapiller neoplazm
   • Ana kanal IPMN
   • Pankreatik nöroendokrin tümör
   • Pankreas psödokisti
   Cevabı göster

   İntraduktal tübülopapiller neoplazm. Kanal lümenini dolduran solid tümör ile çevresindeki kanal sıvısının birlikte görülmesi ITPN için tipik bir ipucudur. IPMN daha çok müsinöz kanal genişlemesi ve kistik yan dallar yapar; nöroendokrin tümör parankim merkezlidir; psödokist sıvı koleksiyonudur ve solid intraduktal tümör değildir.

2. Ana kanal içinde solid dolum defekti bulunan kitlede hangi faz gözlemi ITPN'yi dışlamaz?

   • Arteriyelde hafif hipodens görünüm
   • Yağ dansitesinde homojen odak
   • Kanal dışında hava
   • Kemik korteksinde litik alan
   Cevabı göster

   Arteriyelde hafif hipodens görünüm. ITPN'nin arteriyel kontrastlanması değişkendir; görece hipodens olması tanıyı tek başına dışlamaz. Yağ dansitesinde odak lipom lehinedir; kanal dışı hava fistül/enfeksiyon gibi başka süreçleri düşündürür; kemik litik alanı pankreas intraduktal lezyonunu tanımlamaz.

Kaynaklar

Bu sayfadaki 37 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla tek tek karşılaştırıldı (2026-10-08).

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