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Classification of Anatomical Variants of Sylvian Fissure Using MRI: A Retrospective Observational Study |
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Avinesh Varadane, Sujeeth Mariyappan, Balavaitheeswar Ramalingam, Elamparidhi Padmanaban, Umamageswari Amirthalingam 1. Assistant Professor, Department of Radiodiagnosis, Sri Manakula Vinayagar Medical College and Hospital, Puducherry, India. 2. Resident, Department of Radiodiagnosis, Sri Manakula Vinayagar Medical College and Hospital, Puducherry, India. 3. Assistant Professor, Department of Radiodiagnosis, Sri Manakula Vinayagar Medical College and Hospital, Puducherry, India. 4. Professor, Department of Radiodiagnosis, Sri Manakula Vinayagar Medical College and Hospital, Puducherry, India. 5. Professor and Head, Department of Radiodiagnosis, Sri Manakula Vinayagar Medical College and Hospital, Puducherry, India. |
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Correspondence Address : Sujeeth Mariyappan, Madagadipet, Puducherry, India. E-mail: sujeethkm.maruthi@gmail.com |
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| ABSTRACT |  | ||||||
: Introduction: The Sylvian Fissure (SF), which divides the temporal lobe from the frontal and parietal lobes, is a crucial anatomical landmark in neurosurgery. Magnetic Resonance Imaging (MRI) based data on SF morphological variations in the Indian population remain limited, despite its clinical significance. Aim: To evaluate and classify anatomical variations of the SF in healthy adults using MRI. Materials and Methods: The present retrospective observational study was conducted in the Department of Radiodiagnosis at Sri Manakula Vinayagar Medical College and Hospital, Puducherry, India, from January 2025 to June 2025. A total of 325 adults aged between 30 and 60 years were included. Individuals with structural or functional abnormalities of the brain were excluded. Five types (I-V) of SF morphology were identified using T1-weighted axial, coronal, and sagittal images, and hemispheric symmetry was evaluated. Results: Among the 325 MRI brain scans analysed, Type I and Type II SF morphologies were the most frequently observed in both hemispheres. On the right-side, Type II was the most common pattern {140 (43.1%)}, followed closely by Type I {139 (42.8%)}. On the left-side, Type I predominated {144 (44.3%)}, followed by Type II {138 (42.5%)}. Overall, symmetrical SF morphology was observed in the majority of participants {291 (89.5%)}, while asymmetry was noted in a smaller proportion {34 (10.5%)}. Conclusion: By establishing normative reference data, these findings strengthen the utility of MRI in preoperative assessment and underscore the relevance of standardised SF classification in neurosurgical and radiological practice. | |||||||
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| Keywords : Brain anatomy, Cerebral cortex, Hemispheric asymmetry, Lateral sulcus, Magnetic resonance imaging, Neuroimaging anatomy, Neurosurgical landmarks | |||||||
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DOI and Others :
DOI: 10.7860/IJARS/2026/82419.3095
Date of Submission: Aug 02, 2025 Date of Peer Review: Nov 15, 2025 Date of Acceptance: Jan 08, 2026 Date of Publishing: Mar 01, 2026 AUTHOR DECLARATION: • Financial or Other Competing Interests: None • Was Ethics Committee Approval obtained for this study? Yes • Was informed consent obtained from the subjects involved in the study? Yes • For any images presented appropriate consent has been obtained from the subjects. Yes PLAGIARISM CHECKING METHODS: • Plagiarism X-checker: Aug 27, 2025 • Manual Googling: Jan 05, 2026 • iThenticate Software: Jan 07, 2026 (2%) ETYMOLOGY: Author Origin EMENDATIONS: 7 |
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