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Hyoepiglottic ligament

The hyoepiglottic ligament is a key anatomical structure within the larynx, connecting the anterior surface of the epiglottis to the upper border of the hyoid bone. This ligament plays a crucial role in the mobility and function of the epiglottis, particularly during swallowing. Recognition of the hyoepiglottic ligament and its imaging characteristics is important for radiologists and ENT specialists, especially in the context of evaluating tumors, trauma, and inflammatory processes in the supraglottic region.

Anatomy and Function

  • The hyoepiglottic ligament is a midline band of fibrous connective tissue.

  • Extends from the anterior surface of the epiglottis to the superior aspect of the hyoid bone.

  • Functions to stabilize the epiglottis and assist its movement during swallowing.

  • Serves as an important surgical and radiological landmark in the supraglottic larynx.

MRI Appearance

T1-weighted Images

  • The hyoepiglottic ligament appears as a thin, low signal intensity (dark) linear structure.

  • Surrounded by intermediate signal intensity of adjacent soft tissues and fat.

T2-weighted Images

  • The ligament maintains a low signal intensity (hypointense) compared to surrounding soft tissue and pre-epiglottic fat (which appears hyperintense).

  • Clearly demarcates the boundary between pre-epiglottic fat and the anterior aspect of the epiglottis.

STIR (Short Tau Inversion Recovery)

  • The hyoepiglottic ligament remains hypointense (dark), as with other dense connective tissue structures.

  • Enhanced contrast between the ligament and edematous or inflamed adjacent soft tissue, making it easier to detect ligament disruption or infiltration.

CT Appearance

  • The hyoepiglottic ligament is not directly visualized due to its thin, fibrous nature and similar density to adjacent soft tissue.

  • Indirectly identified as a thin, linear soft tissue band between the hyoid bone and the anterior surface of the epiglottis.