Alper DİLLİ, Hale TURNAOĞLU, Tülin OĞUZKAN MERCİMEK, Ahmet Muhteşem AĞILDERE

Spontaneous Ruptured Parasellar Dermoid Tumor: CT and MRI Findings

Dermoid tümörler, ektodermden köken alan, nadir görülen, intrakranial benign konjenital kitlelerdir. Bilgisayarlı tomografide yağ içerikli, kontrast tutulumu göstermeyen, periferik kalsifikasyon içerebilen, düşük dansitede kitle olarak izlenirler. Manyetik rezonans görüntülemede ise T1 ağırlıklı görüntülerde yağ içeriğine bağlı hiperintens, T2 ağırlıklı görüntülerde ise değişen sinyal intensitelerinde heterojen hipohiperintens sinyal özellikleri gösterirler. Bu tümörlerin lipid kısmı yağ baskılı sekanslarda T1 intensitelerini kaybederler. Dermoid tümörlerin spontan rüptürü hastaların çok küçük bir yüzdesinde görülür. Rüptüre olduklarında subaraknoid ve intraventriküler yayılım gösterirler. Dermoid tümör rüptürü sonucu subaraknoid boşlukta ve ventriküler sistemde bilgisayarlı tomografide hipodens, manyetik rezonans görüntülemede ise T1 ağırlıklı görüntülerde hiperintens yağ partiküllerinin görülmesi tipiktir. Ayrıca manyetik rezonans görüntülemede ventriküler sistemde yağ-sıvı seviyelenmesinin izlenmesi tanısaldır. Bu olgu ile, suprasellar yerleşimli rüptüre olmuş bir dermoid tümörün kranial bilgisayarlı tomografi ve manyetik rezonans görüntüleme bulgularının sunulması amaçlanmıştır

Spontan Rüptüre Parasellar Dermoid Tümör: BT ve MRG Bulguları

Dermoid tumors are benign, rare congenital intracranial lesions which arise from the ectoderm. These tumors are seen as non-enhancing, low-density masses that may include peripheral calcification on computed tomography. On magnetic resonance imaging, these tumors are observed hyperintense on T1-weighted images, depending on the lipid content while they are heterogeneous hypo-hyperintense on T2 weighted images. Lipid fraction of these tumors lose their intensity in the fat-suppressed T1 sequences. Spontaneous rupture of dermoid tumors occurs in a small percentage of patients. When they are ruptured, fat droplets spread throughout the subarachnoid space and ventricular system. These fat droplets in the subarachnoid space and ventricular system are often seen as hypodens on computed tomography and as hyperintense on T1 weighted images on magnetic resonance imaging. Also, fat-liquid leveling in the ventricular system have a diagnostic value on magnetic resonance imaging. In this study, we present the computed tomography and magnetic resonance imaging findings of a ruptured parasellar dermoid tumor

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