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Ranulas and their mimics: CT evaluation.

W E Coit, H R Harnsberger, A G Osborn

    Radiology
    |April 1, 1987
    PubMed
    Summary
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    Computed tomographic (CT) imaging helps differentiate ranulas, which are salivary gland retention cysts. CT findings can distinguish simple ranulas in the sublingual space from diving ranulas extending into adjacent areas.

    Area of Science:

    • Radiology
    • Otolaryngology
    • Head and Neck Surgery

    Background:

    • Ranulas are benign retention cysts arising from salivary gland obstruction.
    • Simple ranulas are confined to the sublingual space, while diving ranulas extend into the submandibular and parapharyngeal spaces.

    Purpose of the Study:

    • To review computed tomographic (CT) findings in simple and diving ranulas.
    • To differentiate ranulas from other cystic lesions in the floor of the mouth using CT.
    • To correlate CT imaging features with pathological findings.

    Main Methods:

    • Retrospective review of CT scans from 10 patients with pathologically proven ranulas.
    • Comparison with CT findings in 38 additional patients with various cystic floor of mouth lesions.
    • Review of relevant anatomical structures of the floor of the mouth.

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    Main Results:

    • CT findings for simple and diving ranulas were analyzed.
    • CT demonstrated unilocular cystic masses originating in the sublingual space.
    • Diving ranulas characteristically extended into the submandibular and/or inferior parapharyngeal spaces.

    Conclusions:

    • CT is valuable in diagnosing ranulas and their extent.
    • A unilocular cystic mass from the sublingual space extending inferiorly suggests a diving ranula.
    • Distinguishing simple ranulas from epidermoid cysts solely on CT can be challenging.