Diz kondrokalsinozu (CPPD) BT bulguları

Özet

CPPD dizde özellikle menisküs fibro-kıkırdağı ve hiyalin kıkırdak içindeki kalsifikasyonlarla görülebilir. BT, diz içi mineralizasyonun yerini ve dağılımını gösterebilir; CPPD değerlendirmesinde konvansiyonel grafi ve ultrason önerilir. Kondrokalsinoz, CPP kristal birikimini destekleyen bir görüntüleme bulgusudur; kristalin kimliğini ya da akut artrit varlığını tek başına doğrulamaz. Akut artritte kondrokalsinoz septik artriti dışlamaz; CPP kristal artriti ile septik artrit birlikte bulunabilir.

Faz ve pencere

Kontrastsız tanısal: Menisküs fibro-kıkırdağı veya eklem kıkırdağı içinde çizgisel ya da noktasal mineralizasyon aranır. CPPD birikimi kontrastsız BT'de görülebilir.
Kemik algoritması tanısal: İnce kesit BT rekonstrüksiyonları eklem içi mineralizasyonun yerini ve eklemdeki dağılımını daha iyi göstermeye yardımcı olur.

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

BT bulguları

Menisküs kondrokalsinozu — medial veya lateral menisküsün kama biçimli fibro-kıkırdak dokusu içinde uzanan çizgisel ya da noktasal kalsifikasyon.
Hiyalin kıkırdak mineralizasyonu — femoral kondilin derin hiyalin kıkırdağında çizgisel veya noktasal kalsifikasyon.
Boynuz yerleşimli odak — medial menisküsün ön veya arka boynuzunda çizgisel ya da noktasal mineralizasyon görülebilir.
Birden fazla kompartımanda tutulum — mineralizasyon medial ve lateral tibiofemoral ve patellofemoral kompartımanların birden fazlasında görülebilir.
Kapsülosinovyal mineralizasyon — eklem kapsülü veya sinovyal doku hattında kıkırdak dışı kalsifik odaklar.
Tendon mineralizasyonu — CPPD ile ilişkili kalsifikasyonlar tendon dokusunda da tanımlanmıştır.
Eşlik eden osteoartritik değişiklikler — osteofit, subkondral skleroz, kist ve eklem aralığı daralması OA bulgularıdır; CPPD ile OA birlikte bulunabilir.

Normalde

Medial ve lateral menisküsler tibial plato üzerinde yer alan kama biçimli fibro-kıkırdak yapılardır; mineralizasyon odağının bu dokunun içinde olup olmadığını komşu kemik korteksinden ayırın. Kondrokalsinozla uyumlu kalsifikasyonlar fibro-kıkırdak veya hiyalin kıkırdak içinde çizgisel ya da noktasal 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 s0685; organ sınırları veri setinin otomatik segmentasyonundan, birleştirilerek sadeleştirildi. Görüntüler 2,5 mm kesit aralığına yeniden örneklendi.

Ayırıcı tanı

Temel kalsiyum fosfat (BCP) birikimi de kalsifik odak yapabilir; konvansiyonel BT CPP ile BCP kristallerini güvenilir biçimde ayıramaz.
Osteoartrit: osteofit, subkondral skleroz, subkondral kist ve eklem aralığı daralması dejeneratif bulgulardır; menisküs kalsifikasyonu CPPD'yi düşündürebilir ancak tek başına kristal türünü kanıtlamaz.
Menisküs yırtığı mineralizasyondan ayrı bir yapısal lezyondur; menisküs lezyonlarının değerlendirilmesinde MR en doğru görüntüleme yöntemidir.
Gut artropatisi ürat (MSU) kristalleriyle, CPPD ise CPP kristalleriyle ilişkilidir; konvansiyonel BT CPP ve BCP mineral birikimlerini güvenilir biçimde ayıramaz.
Eklem içi osteokondral cisim, eklem boşluğundaki serbest kemik-kıkırdak fragmanıdır; menisküs içindeki çizgisel mineralizasyonla aynı anatomik bulgu değildir.

Tuzaklar

BT'de görülen kıkırdak mineralizasyonunu doğrudan CPP kristalinin kimyasal kanıtı saymayın; görüntüleme morfolojisi birikimi tarif eder, mineral türü için kristal analizi gerekir.
Osteofit varlığını CPPD lehine özgül bulgu olarak yorumlamayın; odağın menisküs veya hiyalin kıkırdak içinde olduğuna dair anatomik kanıtı ayrıca arayın.
Akut monoartritte kondrokalsinoz saptanması septik artriti dışlamaz; CPP kristal artriti ile septik artrit birlikte bulunabilir.
Mineralizasyon odağını tek bir aksiyel kesitle sınırlamayın; koronal ve sagittal reformasyonlarda eklem içindeki yerleşimini doğrulayın.

Kendini dene

Diz BT'sinde medial menisküs fibrokıkırdağı içinde çizgisel mineralizasyon görülüyor. Bu bulgu en çok hangi görüntüleme tanısıyla uyumludur?
Cevabı göster
Menisküs kondrokalsinozu. Hiyalin veya fibrokıkırdakta noktasal ya da çizgisel yoğunluklar kondrokalsinozla uyumludur. Kondrokalsinoz CPP birikimini destekler ancak tek başına kristal türünü kanıtlamaz.
Akut sıcak ve şiş dizde kontrastsız BT'de medial menisküs içinde mineralizasyon, femorotibial kıkırdak hattında ince kalsifikasyon ve eklem kenarında osteofit görülüyor. Bu bulgulardan hangisi BT ile tek başına çıkarılamaz?
Cevabı göster
Akut CPP kristal artriti. Menisküs ve hiyalin kıkırdak mineralizasyonu ile osteofit, kökte açıkça bildirilen BT bulgularıdır. Kondrokalsinoz rastlantısal ve belirtisiz olabilir; bu morfolojik bulgular akut CPP kristal artritini tek başına kanıtlamaz. Akut artrit tanısı klinik değerlendirmeye ve gerektiğinde sinovyal sıvı analizine dayanır.

İlgili konular

Kaynaklar

Bu sayfadaki 40 cümle ve 2 quiz sorusu aşağıdaki kaynaklardan alıntılarla otomatik olarak karşılaştırıldı; 5 cümle bu karşılaştırmada düzeltildi (2026-10-09).

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