2016 World Health Organization (WHO) Classification of Tumors of the Central Nervous System (CNS) has shown how molecular features can impact the classification of brain tumors. The continued combination of molecular features with histopathology has led to distinguish tumors with similar histopathologic features but distinct clinical prognosis. The 2021 revised 5. edition of the WHO classification further includes molecular features for CNS tumor categorization including MYB/MYBL1 altered diffuse astrocytoma which is a newly recognized type of low-grade pediatric-type brain tumor. We discuss imaging features of two pediatric-type low-grade gliomas with MYB/MYBL1-mutation that encountered at our institution.
Schwannomalar, Schwann hücrelerinden oluşmuş periferik sinir kılıfı tümörleridir. Antik Schwannomalar, Schwannomaların nadir görülen bir alt türü olup kistik kavitasyon alanları, kalsifikasyon ve hyalinizasyon içerirler. "Antik" tabiri uzun süre içerisinde dejeneratif değişiklikler ve diffüz hiposelüler alanlar içermesi nedeniyle kullanılır. Bu olgu sunumu, retroperitoneal bölgede yerleşmiş kistik bir kitlenin antik Schwannoma olabileceğini göz ardı etmememiz gerektiğini göstermektedir.
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