What is the normal Atlantodental interval for an adult?

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The Atlantodental interval refers to the space between the anterior arch of the atlas (the first cervical vertebra) and the odontoid process (dens) of the axis (the second cervical vertebra). In adults, the normal range for this interval is typically measured to be between 1 to 3 millimeters. This space is clinically significant, as an increase beyond this range might indicate conditions such as atlantoaxial instability or other spinal pathologies. It's important for clinicians to understand this normal range as it aids in diagnosing potential cervical spine issues accurately. The range provided in the correct answer reflects accepted anatomical and clinical standards in radiology and orthopedics.