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  • Title: Atlantooccipital assimilation associated with combined atlas arch defect: a radiological case report.
    Author: Suwannakhan A, Trerattanavong P, Yurasakpong L, Kirisattayakul W, Kruepunga N, Tuntiseranee K, Rumpansuwon K, Senarai T.
    Journal: Anat Cell Biol; 2024 Sep 30; 57(3):468-472. PubMed ID: 38735652.
    Abstract:
    In this report, atlantooccipital assimilation (AS), anterior arch defect (AAD), and posterior arch defect (PAD) of the atlas, and several variations around the craniocervical junction were identified on computed tomography (CT) of a patient of unknown sex and age. Coronal and sagittal CT scans showed AS and bilateral fusion of the atlas and the base of occipital bone. Axial CT scan at the atlas revealed PAD type B on the left side and midline AAD. Morphometric measurements indicated a potential ventral spinal cord compression. In addition, mid-sagittal CT revealed the presence of fossa navicularis magna and incomplete formation of the transverse foramen on the right side. This study reports an extremely rare AS associated with AAD, PAD, and other variations of the clivus and the atlas. To our knowledge, no similar case has been reported in the literature.
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