Radiology Lectures | Radquarters

Ultrasound of Sublingual Dermoid Cyst

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In this radiology lecture, we review the ultrasound appearance of sublingual dermoid cyst and explain floor of mouth anatomy!

Key teaching points include:

  • The floor of the mouth is a horseshoe-shaped area beneath tongue and in between sides of mandible, inferiorly bounded by mylohyoid muscle, and containing sublingual space (SLS)
  • SLS medial border: Midline genioglossus/geniohyoid muscle complex; SLS inferolateral border: Mylohyoid muscle
  • Anterior margin of hyoglossus muscle projects into posterior SLS
  • Sublingual dermoid cyst is a rare, benign cyst with squamous epithelial lining and contains skin appendages
  • Dermoid and epidermoid cysts are in same family, terminology often used interchangeably, although epidermoid cysts less common and tend to contain fluid contents only
  • Dermoid cyst mean age of presentation late teens to twenties, average age 30
  • Presents as a slowly enlarging neck mass, may cause dysphagia
  • Often round or oval in shape and homogeneously hypoechoic with punctate echogenic foci
  • May have pathognomonic “sack of marbles” appearance
  • Relationship to mylohyoid is key for surgical planning: Intraoral resection for sublingual (above mylohyoid) location, extraoral approach for submental/submandibular (below mylohyoid) location
  • Most cysts are midline
  • DDx: Suprahyoid thyroglossal duct cyst, ranula (simple and diving), abscess and lymphangioma

    • To learn more about the Samsung RS85 Prestige ultrasound system, please visit: https://www.bostonimaging.com/rs85-prestige-ultrasound-system-4

    Click the YouTube Community tab or follow on social media for bonus teaching material posted throughout the week!

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    The post Ultrasound of Sublingual Dermoid Cyst appeared first on Radquarters.

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    Radiology Lectures | RadquartersBy Daniel J. Kowal, MD
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