İntrakraniyal kalsifikasyon: dağılım ve taklitçiler BT bulguları

Özet

Kontrastsız baş BT’sinde rastlantısal fizyolojik mineralizasyondan enfeksiyon, metabolik hastalık, vasküler bozukluk veya kalsifiye kitleye uzanan geniş bir neden yelpazesi intrakraniyal kalsifikasyon olarak görülebilir. Kontrastsız BT’de intrakraniyal kalsifikasyonlar gösterilebilir; değerlendirmede kalsifikasyonun örüntüsü, boyutu ve yerleşimi dikkate alınır. İntrakraniyal kalsifikasyonların örüntüsünü, boyutunu ve yerleşimini tarif etmek ayırıcı tanıya yardımcı olur. İntrakraniyal kalsifikasyonlar kontrastsız BT’de sık karşılaşılan bulgulardır.

Faz ve pencere

Kontrastsız tanısal: Kontrastsız BT’de intrakraniyal kalsifikasyonlar görülebilir; değerlendirmede örüntü, boyut ve yerleşimleri dikkate alınır. Odakların pallidum, dentat çekirdek, ventrikül içi koroid pleksus, arter duvarı, korteks veya dura ile anatomik ilişkisi bu fazda haritalanır.

Önerilen pencereler G genişlik, M merkez; değerler Hounsfield birimi (HU)

BeyinG 80 / M +40
KemikG 1800 / M +400

BT bulguları

Pineal bez ve habenula — orta hatta birleşik ya da ayrı küçük yoğunluklar fizyolojik mineralizasyonla uyumlu olabilir.
Koroid pleksus kalsifikasyonları fizyolojik olabilir.
Erişkinlerde bazal ganglion kalsifikasyonları rastlantısal bulunabilir; dağılımın yaygınlığı, boyutu ve yerleşimi ayırıcı tanıda dikkate alınmalıdır.
Yaygın, iki taraflı kalsifikasyonlar bazal ganglionlar, talamus ve serebellar dentat çekirdekleri tutabilir.
Sturge–Weber sendromunda kortikal kalsifikasyonlar beyin atrofisiyle birlikte görülebilir.
Parankimal kalsifikasyonlar değerlendirilirken dağılımı, boyutu ve yerleşimi tarif edilir.
İntrakraniyal arter kalsifikasyonları kontrastsız kranial BT’de saptanabilir.
Falx ve tentoryumda dural kalsifikasyonlar görülebilir.
İntrakraniyal kalsifikasyonlar fizyolojik/yaşa bağlı, distrofik, doğumsal, enfeksiyöz, vasküler, neoplastik, metabolik/endokrin, inflamatuvar veya toksik kategorilerde sınıflanabilir; ayırıcı tanıda örüntü ve klinik bağlam dikkate alınır.

Normalde

Pineal bölge, habenula, koroid pleksus ve dura kalsifikasyonları fizyolojik olabilir; bazal ganglion kalsifikasyonları da asemptomatik kişilerde rastlantısal saptanabilir. Kalsifikasyonların örüntüsünü, boyutunu ve yerleşimini tarif edin.

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 s0103; organ sınırları veri setinin otomatik segmentasyonundan, birleştirilerek sadeleştirildi. Görüntüler 2,5 mm kesit aralığına yeniden örneklendi.

Ayırıcı tanı

Primer ailesel beyin kalsifikasyonu iki taraflı ve simetrik olarak bazal ganglionları, talamusu, subkortikal beyaz cevheri ve serebellumu tutabilir.
Hipoparatiroidi, bazal ganglionlarda kalsifikasyonla ilişkili metabolik nedenlerden biridir.
Sturge–Weber sendromu: tek hemisfer korteksinde giriform tram-track kalsifikasyon, leptomeningeal anomali ve ipsilateral atrofiyle birliktedir.

Tuzaklar

Atriumdaki koroid pleksus kalsifikasyonunu değerlendirirken odağın anatomik yerini ve yayılımını aksiyel, sagittal ve koronal yeniden format görüntülerde tarif edin.
Kafa tabanında kemikle örtüşen damarları değerlendirmek için kemik çıkarma görüntüleri damarların daha iyi görülmesine yardımcı olabilir.
Küçük, ara atenüasyonlu odakların niteliği belirsizse çift enerjili BT’de materyal analizi, bunların kanama, kalsifikasyon veya yabancı madde olup olmadığını ayırt etmeye yardımcı olabilir.
İki taraflı pallidal odakları tek başına primer ailesel hastalık diye adlandırmayın; sınırlı yaş ilişkili mineralizasyon ve sekonder metabolik nedenler benzer görünebilir.
Kalsifikasyonların örüntüsü, boyutu ve yerleşimi ayırıcı tanıya yardımcı olur; klinik bağlam da değerlendirmeye katılmalıdır.

Kendini dene

Kontrastsız BT’de pineal bölge ve koroid pleksus kalsifikasyonları görülüyor. Bu yapılardaki kalsifikasyonlar fizyolojik olabilir mi?
Cevabı göster
Sınırlı fizyolojik mineralizasyon. Pineal bölge ve koroid pleksus kalsifikasyonları fizyolojik olabilir; bilateral bazal ganglion kalsifikasyonları ise primer beyin kalsifikasyonunda görülebilir. İntrakraniyal kalsifikasyonlar fizyolojik/yaşa bağlı, enfeksiyöz, vasküler, neoplastik veya metabolik kategorilerde görülebilir; değerlendirmede örüntü, boyut ve yerleşim dikkate alınır.
Görüntülemede leptomeningeal anjiyomlar, ilerleyici beyin atrofisi ve kortikal kalsifikasyonlar birlikte bildirilmiştir. En olası ilişki nedir?
Cevabı göster
Sturge–Weber tipi kortikal vasküler malformasyon. Sturge–Weber sendromunda beyin görüntülemesinde leptomeningeal anjiyom, kortikal kalsifikasyon ve ilerleyici beyin atrofisi bildirilmiştir. Sturge–Weber sendromu beyinde ve gözlerde kapiller-venöz malformasyonlarla karakterizedir; hipoparatiroidide ise intrakraniyal kalsifikasyonlar görülebilir.

İlgili konular

Kaynaklar

Bu sayfadaki 39 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla otomatik olarak karşılaştırıldı; 33 cümle bu karşılaştırmada düzeltildi (2026-10-09).

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