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Pankreas · Taklitçi · Yüksek öncelik

İzodens veya küçük PDAC

Isoattenuating or small PDAC

İzodens veya küçük PDAC: yayımlanmış olgu görüntüsü, aksiyel kesit
Görüntü konuyu kısmen gösteriyor; bulgunun bir bölümü seçilebilir.

4 adım

Görüntü: Lee SS, Kim DW, Lee W ve ark., “Updates on Imaging Assessment of Pancreatic Cancer for Determining Anatomic and Biologic Resectability.”, 2026, Fig. 2. PMC13333231 · doi:10.3348/kjr.2026.0341 · CC BY-NC 4.0. Değişiklik: yeniden boyutlandırıldı.

Özet

Küçük PDAC, pankreas parankimiyle benzer attenüasyonda olduğundan rutin kontrastlı BT'de doğrudan seçilemeyebilir. Böyle olgularda kanalın ani sonlanması, fokal yukarı akım genişlemesi, segmental atrofi ve kontur değişikliği aramayı şüpheli düzeye taşır. İnce kesitli pankreas protokolü ve çok düzlemli değerlendirme görünür kitleyi bulmaya, damar ve kanal ilişkisini çözmeye yardımcı olur. İkincil işaretleri olmayan normal varyant gibi değerlendirmek erken tümörün tanısını geciktirebilir.

Faz ve pencere

Pankreatik parankimal (geç arteriyel) tanısal
Pankreatik parankim fazında küçük PDAC normal pankreasla benzer atenüasyonda kalabilir; fokal ana kanal stenozu veya obstrüksiyonu ve distal kanal genişlemesi doğrudan kitle seçilmese de tanıda ipucu olabilir.
Portal tanısal
Portal venöz fazı da içeren ince kesitli, çok fazlı BT'de damar tutulumu ve metastatik hastalık değerlendirilir; küçük PDAC normal pankreasla benzer atenüasyonda olduğunda kitle doğrudan seçilemeyebilir.

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

BT bulguları

  • Ana pankreatik kanalda kısa segmentte ani daralma veya kesilme, kitle görünmeden önceki ipucu olabilir.
  • Darlığın kuyruk tarafındaki kanalda fokal genişleme ve kesitler boyunca belirgin kalibre farkı görülür.
  • Kanal tıkanıklığının distalindeki pankreas dokusunda segmental hacim kaybı veya lobülasyon azalması gelişebilir.
  • Şüpheli düzeyde pankreasın ön konturunda hafif çökme, asimetri veya normal lobüler yapının silinmesi izlenebilir.
  • Kitle, pankreasla aynı attenüasyonda olabilir; çevre yağ planı ve kanal yönündeki değişiklikler sınırını dolaylı biçimde belli eder.
  • Tümör-damar teması, reseyabiliteyi belirlemede çokfazlı ince kesitli BT ile değerlendirilir.

Normalde

Normal bezde ana pankreatik kanal gövde ve kuyruk boyunca kesintisiz seyreder, parankim lobülasyonu düzenlidir ve segmental incelme beklenmez. İncelemeyi normal komşu segmentle kıyasla: kanal kalibre geçişinin fokal olup olmadığını, aynı düzeyde kontur çökmesi bulunup bulunmadığını ve distal parankimin hacmini değerlendir.

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 s0541; organ sınırları veri setinin otomatik segmentasyonundan, birleştirilerek sadeleştirildi. Görüntüler 2,5 mm kesit aralığına yeniden örneklendi.

Ayırıcı tanı

Kronik pankreatit darlığı
düzensiz ve çok odaklı kanal değişikliği, parankimal kalsifikasyon veya yaygın atrofi eşlik edebilir.
Ana kanal ve yan dal IPMN anatomik alt tipler olarak sınıflandırılır; kistik lezyonun pankreatik kanal sistemiyle bağlantısı değerlendirilir.
Fokal otoimmün pankreatit
bezde daha uzun segmentli tutulum ve gradual daralma ile kanal daralması görülebilir.
Pankreas divisum, dorsal ve ventral pankreatik kanal sistemlerinin birleşme kusuruna bağlı doğuştan anatomik bir varyanttır.
Küçük nöroendokrin tümör
pankreatik fazda çoğunlukla parlak kontrastlanır; duktal tıkanma klasik küçük lezyon görünümü değildir.

Tuzaklar

  • İzodens tümör, bezin doğal lobülasyonu içinde kaybolabilir; yalnız kitle aramak yerine tüm ana kanalı baştan kuyruğa takip et.
  • Kronik pankreatit kanal darlığı tümörü taklit edebilir; yeni tek odaklı kesilme ve bu düzeyde kontur deformitesini kronik değişikliklerden ayrı kaydet.
  • Küçük PDAC boyutu nedeniyle BT’de gözden kaçabilir; pankreası ince kesitli, çok fazlı BT’de dikkatle değerlendir.

Kendini dene

  1. Küçük kitle seçilmiyor; ana kanal kısa segmentte aniden kesiliyor ve kuyrukta fokal genişleme var. En olası tanı nedir?

    Cevabı göster

    İzodens PDAC. Fokal kanal kesilmesiyle aynı seviyedeki yukarı akım genişlemesi küçük veya izodens PDAC için dolaylı bulgudur. Divisum doğuştan drenaj varyantı, kistadenom makrokistik kitle, anevrizma ise damar kökenli kontrastlanan yapıdır.

  2. Kanal darlığına çok sayıda bez kalsifikasyonu ve düzensiz çok odaklı kanal yapısı eşlik ediyor. Daha olası alternatif nedir?

    Cevabı göster

    Kronik pankreatit. Yaygın kalsifikasyon ve çok odaklı duktal düzensizlik kronik pankreatit örüntüsünü destekler. Lipom yağ attenüasyonunda sınırlı odaktır; insulinoma tipik olarak arteriyel hipervaskülerdir, koledok kisti safra kanalında yerleşir.

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Kaynaklar

Bu sayfadaki 35 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla tek tek karşılaştırıldı; 7 cümle bu karşılaştırmada düzeltildi (2026-10-09).

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