Lobar ve bölgesel atrofi örüntüsü BT bulguları

Özet

Bölgesel atrofi, hacim kaybının tüm beyne eşit dağılmadığı ve belirli lob ya da anatomik yapılarda baskınlaştığı görüntüleme örüntüsüdür. Bilişsel veya davranışsal yakınması olan hastalarda kontrastsız BT büyük ölçekli frontal, temporal ya da posterior baskınlığı gösterebilir; hafif hipokampal değişiklikleri değerlendirmede MR daha duyarlıdır. Asimetri, temporal boynuz ve hipokampal kontur ile eski doku kaybı birlikte incelenmelidir. Fokal ensefalomalazi bölgesel atrofiyi taklit edebileceğinden yanlış patern atfı klinik-radyolojik eşleşmeyi bozabilir.

Faz ve pencere

Kontrastsız tanısal: Frontal veya temporal konveksite sulkuslarında, Sylvian fissürde ya da parietooksipital sulkuslarda lobar ağırlıklı genişleme; hipokampal seviyede temporal boynuz ve koroid fissür çevresinde BOS aralığı artışı görülebilir. BT'de geçerli HU eşiği yoktur; dansite değil anatomik dağılım değerlendirilir.

Önerilen pencereler: Beyin (G 80 / M 40), Subdural (G 200 / M 75).

BT bulguları

Frontal baskın sulkal açılma — frontal konveksite sulkusları karşılaştırılabilir parietal sulkuslardan daha geniştir.
Anterior temporal hacim kaybı — temporal kutup çevresinde sulkuslar açılır ve temporal boynuz hacmi artabilir.
Medial temporal hacim kaybı — hipokampal formasyon küçülür, koroid fissür ve temporal boynuz geniş görünür.
Posterior baskınlık — parietal ve oksipital konveksitedeki sulkuslar frontal bölgeye göre daha belirgin açılır.
Lobar asimetri — bir hemisferde giral hacim azalması ve sulkal genişleme karşı tarafa göre öne çıkar.
Ventrikül konturunda eşlik eden değişim — temporal boynuz veya frontal boynuz genişlemesi, çevre parankim hacim kaybıyla birlikte okunur.
Fokal kaviter doku kaybı — ensefalomalazide BOS yoğunluğunda kama ya da düzensiz kavite ve komşu gliozis/volüm kaybı görülebilir.

Normalde

Normal frontal ve parietal konveksite sulkusları benzer derinlikte, temporal boynuzlar ise hipokampal baş ve gövdeye komşu dar BOS çizgileri şeklindedir. Kıyaslamada frontal kutup, anterior temporal lob, hipokampal oluk ve parietooksipital konveksiteyi aynı seviyelerde sağ-sol ve ön-arka yönde karşılaştırın.

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

Kronik arteriyel enfarkt: kama biçimli doku kaybı belirli damar alanına uyar ve çevresinde fokal sulkal genişleme bulunur.
Eski travmatik kontüzyon: çoğunlukla inferior frontal veya anterior temporal yüzeyde düzensiz ensefalomalazi odakları görülür.
Normal basınçlı hidrosefali: ventrikül genişlemesi lobar kortikal atrofiyle uyumsuz olabilir; konveksite sulkusları dar kalabilir.
Asimetrik kortikal gelişim veya eski cerrahi: hacim farklılığı olabilir; kemik defekti, cerrahi öykü veya uzun dönem stabilite yol gösterir.

Tuzaklar

Tek taraflı sulkal genişlemeyi dejeneratif lobar patern saymadan önce komşu dilimlerde damar alanına uyan kaviter doku kaybı arayın.
Aksiyel BT'de hipokampal uzun eksen eğik kesilir; medial temporal atrofiye dair ince derecelendirme için koronal MR tercih edilir.
Frontal, temporal veya posterior baskınlık tek başına belirli demans etiyolojisini kanıtlamaz; görüntü örüntüsü klinik fenotiple eşleştirilir.

Kendini dene

Davranış değişikliği olan hastada anterior temporal sulkuslar asimetrik geniş; fokal kavite yok. Bulguyu en iyi ne adlandırır?
Cevabı göster
Anterior temporal baskın atrofi. Lobar ağırlıklı sulkal açılma ve kaviter damar alanı defekti olmaması anterior temporal atrofi örüntüsünü destekler. Kronik enfarkt kaviter olabilir; hidrosefali ventriküler paternle, akut ödem ise sulkus silinmesiyle seyreder.
Sol inferior frontal lobda BOS yoğunluklu kama biçimli boşluk ve çevresinde hacim kaybı var. En olası bulgu hangisidir?
Cevabı göster
Kronik enfarkt sonrası ensefalomalazi. Kama biçimli parankim kavitesi ve komşu hacim kaybı eski vasküler hasara uyar. Lobar atrofi daha yaygın sulkal açılma yapar; akut ödem doku hacmini artırıp sulkusları siler, ekstraaksiyel koleksiyon parankim dışında yer alır.

İlgili konular

Kronik infarkt sonrası ensefalomalazi

Kaynaklar

Bu sayfadaki 36 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla otomatik olarak karşılaştırıldı (2026-10-08).

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