Morphometric Analysis of Foramen Magnum in Adult CT Images: A Cross-Sectional Study

Abstract

Background: The foramen magnum is a vital anatomical structure located at the base of the skull, transmitting the lower brainstem, vertebral arteries, meninges, and associated neurovascular structures. Accurate morphometric assessment of the foramen magnum is important in neurosurgery, radiology, anthropology, and forensic medicine. Computed tomography (CT) provides precise measurements of cranial base anatomy and facilitates evaluation of morphometric variations in living populations.
Aim: To evaluate the morphometric dimensions of the foramen magnum in adult CT images and establish baseline data useful for clinical, surgical, and forensic applications.
Materials and Methods: A cross-sectional observational study was conducted using CT images of adult patients attending the Department of Radiology, Government Medical College, Medak. Adult subjects between 18 and 79 years of age who underwent cranial CT examination were included. Patients with craniovertebral junction anomalies, fractures, neoplasms, or pathological conditions affecting the skull base were excluded. Morphometric parameters including anteroposterior diameter, transverse diameter, right oblique diameter, and left oblique diameter of the foramen magnum were measured using CT imaging. Data were analyzed using appropriate statistical methods, and morphometric differences between sexes were evaluated.
Results: Morphometric assessment demonstrated that the anteroposterior diameter was consistently greater than the transverse diameter in the majority of subjects. Male participants exhibited larger mean dimensions of the foramen magnum compared with female participants. Significant variations were observed among the measured parameters, reflecting normal anatomical diversity within the study population. The findings established normative morphometric values for the adult population studied and highlighted the utility of CT imaging in evaluating cranial base anatomy.
Conclusion: The present study provides valuable morphometric data regarding the dimensions of the foramen magnum in adults. These measurements may aid neurosurgeons in planning craniovertebral junction procedures, assist radiologists in anatomical assessment, and contribute to forensic identification and anthropological research. CT-based morphometric evaluation offers a reliable and non-invasive method for studying variations of the foramen magnum in living populations.