Fronto-Maxillary Facial FMF Angle

FMF Angle

• Definition: Angle between the line along the upper surface of the maxilla and the line along the frontal bone.
• Normal range: ~76–83° at 11–13+6 weeks
• Purpose: Helps assess facial disproportions or micrognathia
• Increased FMF angle: Associated with Down syndrome (Trisomy 21)
• How to Measure:
  • Use mid-sagittal view of the face
  • Draw one line along the upper aspect of the maxilla
  • Draw a second line tangential to the frontal bone
  • Measure the angle between these two lines