Paraspinal ekstramedüller hematopoez

Özet

Kronik hemolitik anemi, talasemi veya miyelofibrozda kemik iliği dışındaki hematopoetik doku paraspinal kitleler oluşturabilir. Kontrastsız BT, alt torakal düzeyde düzgün sınırlı veya lobüle paravertebral yumuşak doku kitlelerini, içlerinde heterojen yağ odaklarını ve komşu vertebra/kaburga korteksinde erozyonun bulunmadığını gösterir. Görünümün hematolojik öyküyle birlikte değerlendirilmesi olası tanıyı öne çıkarır; atipik bulgularda doku tanısı gerekebilir. Epidural uzanımın veya spinal kanal basısının atlanması nörolojik riskin fark edilmesini geciktirebilir.

Faz ve pencere

Kontrastsız tanısal

Toraks BT'de alt torakal paravertebral oluklarda düzgün sınırlı, sıklıkla bilateral lobüle yumuşak doku kitleleri görülür; etkin hematopoetik doku yumuşak doku atenüasyonundadır, kronik lezyonlarda yağ odakları bulunabilir. Kontrastsız BT kitle dağılımını ve makroskobik yağ varlığını gösterebilir; mikroskobik yağ deteksiyonu veya intraspinal uzanım değerlendirmesi için MR daha uygun olabilir.

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

BT bulguları

• Bilateral paraspinal kitleler — alt torakal düzeyde, düzgün sınırlı veya lobüle yumuşak doku dansitesinde oluşumlar.
• Parakostal uzanım — kitle posterior kaburga komşuluğuna oturabilir; kontur iyi sınırlı kalır.
• İç yağ odakları — daha kronik ya da yağlı dönüşüm gösteren hematopoetik dokuda heterojen düşük atenüasyon alanları görülebilir.
• Vertebra gövdesinin ince korteksinden hematopoetik dokunun çıkışı, bu lokalizasyonun mekanizmasından biri olarak düşünülebilir.
• Kemik destrüksiyonunun olmaması — posterior kostovertebral kortekste erozyon ve agresif kemik yıkımı beklenen tipik bulgu değildir.
• Çok odaklılık — paraspinal kitlelere perirenal, retroperitoneal, presakral veya hepatosplenik hematopoetik odaklar eşlik edebilir.
• Epidural uzanım — spinal kanala doğru doku geçişi ve kanal daralması varsa omurilik basısı olasılığı ayrıca belirtilir.

Normalde

Posterior mediastin normalde öncelikli olarak paravertebral yağ planları ve nörojenik yapılardan oluşur; patolojik kitleler bulunmaz.

Ayırıcı tanı

Nörojenik tümör

çoğunlukla tek taraflı, vertebral foramene veya spinal kanala uzanan ve forameni genişletebilen kitle şeklindedir.

Lenfoma

paravertebral kitlelerle birlikte sistemik lenfadenopati veya farklı nodal bölge tutulumu düşünülür.

Paravertebral apse

vertebra son plaklarında destrüksiyon, disk aralığında değişiklik veya çevre yağda inflamatuvar bulanıklık eşlik edebilir.

Lateral meningosel

kitle BOS atenüasyonundadır ve genişlemiş nöral foramenle spinal kanal ya da meninkslerle devamlılık gösterebilir.

Tuzaklar

• Düzgün sınırlı her posterior mediastinal kitleyi nörojenik tümör saymayın; bilateral alt torakal dağılım ve kronik anemi öyküsünü eşleştirin.
• Yağ içeriği hematopoetik lezyonun yaşını yansıtabilir; yalnızca yağ var diye lipom veya liposarkom olarak sınıflamayın.
• BT'de belirgin kanal tutulumu görünmese bile epidural hematopoez omurilik basısı yapabilir; nörolojik belirti varsa MR ile kanal değerlendirmesi gerekir.

Kendini dene

1. Talasemili hastada alt torakal düzeyde iki taraflı, lobüle paravertebral kitleler var; komşu korteks korunmuş. En olası tanı hangisidir?

   • Ekstramedüller hematopoez
   • Nörojenik tümör
   • Paravertebral apse
   • Lateral meningosel
   Cevabı göster

   Ekstramedüller hematopoez. Kronik anemiyle birlikte bilateral alt torakal kitleler ve kemik destrüksiyonunun olmaması ekstramedüller hematopoezi güçlü biçimde destekler. Diğer seçeneklerde tipik olarak tek taraflı foraminal ilişki, inflamatuvar kemik-disk bulgusu veya BOS devamlılığı beklenir.

2. Paraspinal yumuşak doku kitlesi vertebral forameni genişletiyor ve tek taraflı spinal kanala uzanıyor. En olası alternatif nedir?

   • Schwannom
   • Ekstramedüller hematopoez
   • Silikozis
   • Nodal amiloidoz
   Cevabı göster

   Schwannom. Foramen genişlemesi ve tek taraflı kanal uzanımı sinir kılıfı kökenli schwannomu destekler. Ekstramedüller hematopoez çoğunlukla iki taraflı lobüle paraspinal kitleler şeklindedir; diğer seçenekler bu foraminal paterni oluşturmaz.

Kaynaklar

Bu sayfadaki 35 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla tek tek karşılaştırıldı; 8 cümle bu karşılaştırmada düzeltildi (2026-10-08).

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