McGrigor-Campbell lines are imaginary lines traced across the face on an occipitomental (Waters) view skull radiograph to assess for fractures of the middle third (especially) of the face 3:
first line is traced from one zygomaticofrontal suture to another, across the superior edge of the orbits
second line traces the zygomatic arch, crosses the zygomatic bone, and traces across the inferior orbital margins to the contralateral zygomatic arch
third line connects the condyle and coronoid process of the mandible and the maxillary antra on both sides
fourth line crosses the mandibular ramus and the occlusal plane of the teeth
The face is inspected for any asymmetry along these lines and Dolan's lines.
The first line is breached in the superior orbital wall as seen in the black eyebrow sign.
The second line is breached in the inferior orbital wall fracture as seen in the tear drop sign.
The first and second line can also assess for any nasal septum deviation as it is assessed in the midline.
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