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Pterion is the important surgical landmark in temporal fossa, deeper to which vital areas of the brain are located. Injuries are common at this suture area due to confluence of multiple bones which are relatively slender and weak. Since the variations in morphology of the pterion is common, thorough knowledge of its location, types and subtypes, helps health professionals of varied speciality to confidently explore this area and perform the necessary interventions. Aim: This study is aimed to determine the prevalence of different types of pterion, position of pterion, and compare the morphological variance between the right and left side among adult human skulls in Andhra Pradesh. Materials and Methods: This cross-sectional study on human skull bones was conducted in Apollo institute of medical sciences and research, Chittoor, and Great eastern medical school and hospital, Srikakulam of Andhra Pradesh state in India from June 2020-August 2020. The study was conducted on 54 adult dried human skulls with well-defined sutures. The pterions of both sides of the skulls were keenly observed and studied for the type and subtypes of Pterions based on Murphy’s classification. The position of pterion was measured from Frontozygomatic Suture (FZS) and Midpoint of Zygomatic Arch (MZA) with Vernier callipers. Data was analysed with descriptive statistics and also compared with earlier research works. Results: Sphenoparietal 89 (82.4%) was the commonly observed pterion type in the present study, frontotemporal pterion was not found. Pterion was positioned at a Mean distance of 3.16±0.48 cm and 3.20±0.50 cm from frontozygomatic arch on right and left side, respectively. From MZA the pterion was present at 3.70±0.35 cm and 3.78±0.35 cm on right and left side, respectively. Conclusion: The present study reveals variations in sutural morphology pattern and position of pterion in the skulls oftentimes. Notable difference was observed while comparing the position of pteria with other country population. Cognizance of such variations would help the radiologists, neurosurgeons and forensic experts to diagnose opine and treat judiciously.

A Cross-sectional Study on Morphology and Position of Pterion in Andhra Pradesh Population