Y line of Ennis 2

Definition: An anatomical landmark created by the superimposition of the floor of the nasal cavity and the border of the maxillary sinus.

Radiographic Features:

Location: Most commonly found superior to the maxillary canine apex. Sometimes it will be more distal and superior to the first premolar apices.

Edge: Well-defined, corticated.

Shape: Inverted Y.

Internal: Radiopaque.

Other: None.

Number: Single (one per side). 🙂

(click to enlarge)

Y line of Ennis

Y line of Ennis (yellow lines) created by floor of nasal cavity (straight radiopaque line) and border of maxillary sinus (curved radiopaque line) superior to the maxillary canine.

Y line of Ennis (yellow arrows)

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