A small bursa between the temporalis fascia and the zygomatic arch, reducing friction as the temporalis muscle passes deep to the arch during jaw opening and closing. It is most prominent at the malar eminence where the fascia anchors to the arch.
Zygomatic arch bursitis presents as a focal swelling at the malar eminence, sometimes triggered by direct trauma to the cheekbone. It must be differentiated from a zygomatic fracture haematoma, sinus mucocele, and parotid gland enlargement. The bursa is identifiable on coronal MRI or ultrasound as a thin fluid collection between the temporalis fascia and the arch.
Post-traumatic bursal swelling at the zygomatic arch from a direct cheekbone blow, distinguished from a zygomatic fracture by absence of crepitus, tenderness on arch palpation, and normal facial CT.
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