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Publication Open Access Rare and challenging extra-axial brain lesions: CT and MRI fndings with clinico-radiological differential diagnosis and pathological correlation(AVES Ibrahim Kara [email protected] 105/9 Buyukdere Cad Mecidiyekoy,Sisli, Istanbul 34394, 2014) Demir, Mustafa Kemal; Kurtkaya-Yapıcıer, Özlem Sahan; Onat, Elif; Toktaş, Zafer Orkun; Akakın, Akın; Urgun, Kamran; Kılıç, Türker; Demir, Mustafa Kemal, Department of Radiology, Bahçeşehir Üniversitesi, Istanbul, Turkey; Kurtkaya-Yapicier, Özlem Sahan, Department of Pathology, Bahçeşehir Üniversitesi, Istanbul, Turkey; Onat, Elif, Department of Pathology, Bahçeşehir Üniversitesi, Istanbul, Turkey; Toktaş, Zafer Orkun, Department of Neurosurgery, Bahçeşehir Üniversitesi, Istanbul, Turkey; Akakin, Akin In, Department of Neurosurgery, Bahçeşehir Üniversitesi, Istanbul, Turkey; Urgun, Kamran, Department of Neurosurgery, Bahçeşehir Üniversitesi, Istanbul, Turkey; Kilic, Turker D., Department of Neurosurgery, Bahçeşehir Üniversitesi, Istanbul, TurkeyThere are many kinds of extra-axial brain tumors and tumor-like lesions, and definitive diagnosis is complicated in some cases. In this pictorial essay, we present rare and challenging extra-axial brain lesions including neuroenteric cyst, primary leptomeningeal melanomatosis, isolated du-ral neurosarcoidosis, intradiploic epidermoid cyst, ruptured dermoid cyst, intraventricular cavernoma, and cavernous hemangioma of the skull with imaging findings and clini-co-radiological differential diagnosis, including the pathologic correlation. Familiarity with these entities may improve diagnostic accuracy and patient management. © Turkish Society of Radiology 2014. © 2014 Elsevier B.V., All rights reserved.Publication Open Access A newborn with hemorrhagic meningoencephalitis due to Proteus mirabilis(2017) Çoşkun, Yeşim; Akman, Ipek Özkan; Yıldırım, Canan Kocaman; Demir, Mustafa Kemal; Çoşkun, Yeşim, Department of Pediatrics, Bahçeşehir Üniversitesi, Istanbul, Turkey; Akman, Ipek Özkan,; Yıldırım, Canan Kocaman,; Demir, Mustafa Kemal,Neonatal meningoencephalitis is a severe condition for the developing brain of a newborn. Radiologic findings of necrosis and liquefaction due to hemorrhagic meningoencephalitis may be confused with brain abcess. In this article, we report a neonate having liquefaction necrosis due to hemorrhagic meningoencephalitis mimicing intracranial abscess due to Proteus mirabilis. We would like to describe the clinical course and evolution of brain imaging and emphasize the importance of the serial MR imaging (MRI). This record is sourced from MEDLINE®/PubMed®, a database of the U.S. National Library of MedicinePublication Open Access Susac’s syndrome as a rare arterial stroke mimic(SAGE Publications Inc., 2019) Onat Demirci, Nuri; Hacımustafaoğlu, Ali Murat; Kenangil, Gülay Ozgen; Cevher, Ayşe Zeynep; Demir, Mustafa Kemal; Onat Demirci, Nuri, Department of Neurology, Bahçeşehir Üniversitesi, Istanbul, Turkey; Hacımustafaoğlu, Ali Murat, Department of Ophthalmology, Medical Park Göztepe Hospital, Istanbul, Turkey; Kenangil, Gülay Ozgen, Department of Neurology, Bahçeşehir Üniversitesi, Istanbul, Turkey; Cevher, Ayşe Zeynep, Third class medical student, Yeditepe University, Istanbul, Turkey; Demir, Mustafa Kemal, Department of Radiology, Bahçeşehir Üniversitesi, Istanbul, TurkeySusac’s syndrome is an uncommon autoimmune microangiopathy characterised mainly by encephalopathy, hearing loss and branch retinal artery occlusions. We present here a case of Susac’s syndrome with initial isolated arterial stroke symptoms which are not an uncommon feature of the disease. © 2022 Elsevier B.V., All rights reserved.Publication Metadata only Skeletal muscle hydatid disease with intense 18F-FDG uptake(Oxford University Press, 2019) Demir, Mustafa Kemal; Ofluoǧlu, Önder; Demir, Mustafa Kemal,; Ofluoǧlu, Önder, Department of Orthopedic Surgery and Traumatology, Bahçeşehir Üniversitesi, Istanbul, Turkey, Department of Radiology, Bahçeşehir Üniversitesi, Istanbul, Turkey[No abstract available]