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Pankreatoblastom

Pancreatoblastoma

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Pankreatoblastom: yayımlanmış olgu görüntüsü, aksiyel kesit

4 adım

Görüntü: Zhang X, Ni SJ, Wang XH ve ark., “Adult pancreatoblastoma: clinical features and Imaging findings.” 2020, Figure 4. PMC7347875 · doi:10.1038/s41598-020-68083-2 · CC BY 4.0. Değişiklik: kırpıldı, yeniden boyutlandırıldı, odak işaretleri eklendi.

Özet

Pankreatoblastom, özellikle çocukluk çağında görülen nadir bir pankreas malignitesidir; erişkinde de ortaya çıkabilir. BT'de çoğu kez büyük, lobüle, heterojen ve kistik/nekrotik bölümler içeren kitle şeklindedir; kalsifikasyon eşlik edebilir. Kontrastlı BT tümörün pankreas kaynaklı olup olmadığını, komşu damar ve karaciğerle ilişkisini ve uzak yayılımı tanımlamaya yardım eder. Tümörün çok büyük boyutu veya dışa doğru ekzojen büyümesi nedeniyle karaciğer ya da retroperiton kökenli sanılma riski taşıyabilir.

Faz ve pencere

Kontrastsız tanısal
Kitle içi kalsifikasyonlar ve nekrotik alanların dansitesi ile kitle boyutu değerlendirilir; kalsifikasyonlar dağılmış veya kümelenmiş olarak görünebilir.
Arteriyel tanısal
Kontrastlı BT'de tümörde arteriyel fazda hafif veya belirgin kontrastlanma görülebilir.
Portal tanısal
Lobüle kitlenin pankreasla bağlantısı, venöz damar itilmesi veya invazyonu, karaciğer lezyonları, lenf düğümleri ve peritoneal sıvı/odaklar incelenir.

Önerilen pencereler: Batın (G 400 / M 50), Karaciğer (G 150 / M 30), Yumuşak doku (G 400 / M 40).

BT bulguları

  • Pankreas başı, gövdesi veya kuyruğundan kaynaklanabilen büyük lobüle solid kitle
  • Tümör sınırları belirgin olabileceği gibi, komşu doku veya organ infiltrasyonu varsa belirsizleşebilir; bazı olgularda kitle solid-kistik yapıdadır.
  • Tümör içinde kontrastlanmayan nekrotik veya kistik alanlar ile heterojen solid bileşenler görülür.
  • Tümör içinde noktasal, kaba ya da kümeli kalsifikasyon
  • Ekzofitik büyüme ve komşu mide, duodenum, dalak veya karaciğerin yer değiştirmesi
  • Büyüklüğe bağlı damar itilmesi; bazı olgularda damar ya da komşu doku invazyonu
  • Karaciğer, periton veya uzak bölgelerde metastatik hastalık
  • Pankreatoblastom büyük, iyi sınırlı veya lobüle bir kitle olarak görülebilir; kistik bileşen heterojenliğe katkıda bulunabilir ve kalsifikasyonlar eşlik edebilir.

Normalde

Normal pankreas parankimi, kitlelerin kontrastlanma ve atenüasyon özelliklerinin karşılaştırılmasında referans alınır. Pankreatoblastom pankreas parankiminden dışa doğru ekzojen büyüyebilir; bazı olgularda damarları çevreleyebilir veya komşu organlara invaze olabilir.

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

Solid psödopapiller neoplazm
daha çok genç kadınlarda kapsüllü ve hemorajik merkezli solid-kistik kitle görünür; pankreatoblastomda çocuk yaşı, lobülasyon ve kalsifikasyon daha destekleyicidir.
Asiner hücreli karsinom
büyük heterojen pankreatik kitle yapabilir; pankreatoblastomda yaş profili ve kalsifikasyon sıklığı ayırıcı bağlam sağlar.
Hepatoblastom çocukluk çağındaki malign karaciğer tümörlerinden biridir; büyük abdominal kitlelerde köken organı belirlemek için lezyonun anatomik ilişkileri değerlendirilmelidir.
Nöroblastom, çocukluk çağının en sık ekstrakraniyal solid tümörüdür.
Primer ve sekonder pankreatik lenfoma, solid pankreatik kitlelerin ayırıcı tanısında yer alır.
Wilms tümörü çocukluk çağında görülen bir böbrek malignitesidir ve genotip temelli gözetim protokolleriyle izlenir; abdominal kitlelerin kökenini belirlemede yaş ve görüntüleme morfolojisi yardımcı olabilir.
Pediatrik abdominal kitlelerde, özellikle solid organ dışı lezyonlarda, görüntüleme ile kitlenin merkezinin belirlenmesi tanısal yaklaşımı destekler.

Tuzaklar

  • Çok büyük boyutlu veya ekzojen büyüyen tümörler karaciğer ya da retroperiton kökenli sanılabilir; primer organ tanısı için ekzojen uzanım ve komşu damar ilişkileri birlikte değerlendirilmelidir.
  • Nekrotik ve kistik dejenerasyon tümörü primer kistik neoplazma benzetebilir; heterojen solid bileşenler ve kalsifikasyonlar ayırt edici bulgulardır.
  • Pankreatoblastomlar splenoportal aksı invaze edebilir; portal ven içinde tümör trombüsü görüntülemede görülebilir.

Kendini dene

  1. Pankreatoblastomda BT veya MR'da görülebilen kalsifikasyon dağılımı nasıl tarif edilir?

    Cevabı göster

    Dağınık veya kümelenmiş. Pankreatoblastomda kalsifikasyonlar dağınık veya kümelenmiş olabilir.

  2. Pankreatoblastomlu çocuklarda portal ven içinde görülen tümör dokusu görüntülemede nasıl adlandırılır?

    Cevabı göster

    Portal ven tümör trombüsü. Çocuklarda pankreatoblastom portal venöz invazyon yapabilir; portal ven içindeki tümör dokusu tümör trombüsü olarak adlandırılır.

Kaynaklar

Bu sayfadaki 38 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla otomatik olarak karşılaştırıldı; 22 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.