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Related Experiment Videos

The calcar avis: demonstration with cranial US.

M A DiPietro, B A Brody, R L Teele

    Radiology
    |August 1, 1985
    PubMed
    Summary

    The calcar avis is a normal anatomical structure that indents the occipital horn of the lateral ventricle. Recognizing this normal variant prevents misdiagnosis of masses or blood clots on ultrasonograms.

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    Area of Science:

    • Neuroanatomy
    • Medical Imaging
    • Pediatric Radiology

    Background:

    • The occipital horn of the lateral ventricle is a complex anatomical region.
    • Variations in its appearance can sometimes mimic pathology on imaging.

    Purpose of the Study:

    • To describe the calcar avis and its typical appearance on ultrasonography.
    • To emphasize its recognition as a normal anatomical variant.

    Main Methods:

    • Review of ultrasonographic images of the neonatal brain.
    • Correlation of imaging findings with known neuroanatomical structures.

    Main Results:

    • The calcar avis is an indentation of the medial wall of the occipital horn.
    • A prominent calcar avis can be visualized on ultrasonograms, particularly via the posterior fontanel.
    • It should not be confused with abnormal findings.

    Conclusions:

    • The calcar avis is a common and normal finding on neonatal brain ultrasonography.
    • Familiarity with this variant aids in accurate interpretation and avoids unnecessary concern for pathology.

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