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Prevalence And Morphometric Analysis Of Fossa Navicularis Magna In Dry Human Skulls

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Fossa Navicularis Magna

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Tasleem M, Hina M, Qureshi F, Aslam I, Atta I, Tafweez R. Prevalence And Morphometric Analysis Of Fossa Navicularis Magna In Dry Human Skulls. JRMC [Internet]. 2023 Jun. 24 [cited 2024 Apr. 16];27(2). Available from:


Introduction: Basiocciput is the part of occipital bone present on the inferior aspect of skull. Fossa Navicularis Magna-an osseous defect is a variation in normal anatomy of basiocciput. Lately few case reports presented this fossa as a cause of spread of infection from nasopharynx to brain resulting in meningitis and osteomyelitis.

Objectives: This study aims to find the incidence and morphometry of this fossa in Pakistani populace to avoid any misdiagnosis or misinterpretations.

Materials & Methods: This study was conducted on dry human skulls at King Edward Medical University Lahore. Fossa was measured in its transverse and vertical diameters and to locate the fossa its distance from various anatomical land marks such as foramen ovale, foramen Lacerum, carotid canal, occipital condyles, pharyngeal tubercle and posterior border of vomer was noted.

Results:  The incidence of this fossa was found to be 5.3% in Pakistani population. Predominantly oval shaped, fossa measured 5.5 and 3.06 mm in vertical and transverse diameters respectively. It was 12.2 mm posterior to vomer and 5.9 mm anterior to pharyngeal tubercle.

Conclusion: This study is useful for radiologists and clinicians in avoiding any misinterpretations on radiographs and unnecessary investigations


Adanir SS, Bahşi İ, Orhan M, Kervancioğlu P, Yalçin ED. Radiologic evaluation of the fossa navicularis: incidence, morphometric features, and clinical implications. Surgical and Radiologic Anatomy. 2021 Nov;43(11):1887-93.

Cankal F, Ugur HC, Tekdemir I, Elhan A, Karahan T, Sevim A. Fossa navicularis: anatomic variation at the skull base. Clinical Anatomy: The Official Journal of the American Association of Clinical Anatomists and the British Association of Clinical Anatomists. 2004;17(2):118-22.

Beltramello A, Puppini G, El-Dalati G, Girelli M, Cerini R, Sbarbati A, Pacini P. Fossa navicularis magna. American journal of neuroradiology. 1998 Oct 1;19(9):1796-8.

Alalade AF, Briganti G, Mckenzie JL, Gandhi M, Amato D, Panizza BJ, Bowman J. Fossa navicularis in a pediatric patient: anatomical skull base variant with clinical implications. Journal of Neurosurgery: Pediatrics. 2018 Nov 1;22(5):523-7.

Segal N, Atamne E, Shelef I, Zamir S, Landau D. Intracranial infection caused by spreading through the fossa navicular magna–A case report and review of the literature. International Journal of Pediatric Otorhinolaryngology. 2013 Dec 1;77(12):1919-21.

Prabhu SP, Zinkus T, Cheng AG, Rahbar R. Clival osteomyelitis resulting from spread of infection through the fossa navicularis magna in a child. Pediatric radiology. 2009 Sep;39(9):995-8.

Adanir SS, Bahşi I, Kervancioğlu P, Orhan M, Öztürk EM, Yalçin ED, Topsakal V. Radiologic Evaluation of the Fossa Navicularis on Dry Skull: A Comparative CBCT Study. Journal of Craniofacial Surgery. 2022 Oct 11:10-97.

Bayrak S, Göller Bulut D, Orhan K. Prevalence of anatomical variants in the clivus: fossa navicularis magna, canalis basilaris medianus, and craniopharyngeal canal. Surgical and Radiologic Anatomy. 2019 Apr;41(4):477-83. DOI: 10.1007/s00276-019-02200-3

Murjani B, Bhosale R, Ramaswami E, Kadam S, Ramchandani A. Anatomical variations of clivus: a descriptive anatomical study. Surgical and Radiologic Anatomy. 2021 Jun;43(6):945-51. DOI: 10.1007/s00276-021-02686-w

McCartney TE, Mupparapu M. Anomalies of the clivus of interest in dental practice: A systematic review. Imaging Science in Dentistry. 2021 Dec;51(4):351. DOI: 10.5624/isd.20210039

Ersan N. Prevalence and morphometric features of fossa navicularis on cone beam computed tomography in Turkish population. Folia morphologica. 2017;76(4):715-9. DOI:10.5603/FM.a2017.0030

Kaplan FA, Yesilova E, Bayrakdar IS, Ugurlu M. Evaluation of the relationship between age and gender of fossa navicularis magna with cone-beam computed tomography in orthodontic subpopulation. Journal of The Anatomical Society of India. 2019 Jul 1;68(3):201. Doi Number: 10.4103/jasi.jasi_79_19

Sheikh S, Iwanaga J, Rostad S, Rustagi T, Oskouian RJ, Tubbs RS. The first histological analysis of the tissues lining the fossa navicularis: insights to its etiology. Cureus. 2017 May 31;9(5). DOI: 10.7759/cureus.1299

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Copyright (c) 2023 Maria Tasleem, Mohtasham Hina, Fauzia Qureshi, Imtiaz Aslam, Iram Atta, Raafea Tafweez