Dynamic soft tissue changes in the orbit after a blowout fracture

Area of Science:

• Ophthalmology
• Radiology
• Trauma Surgery

Background:

• Blowout fractures can cause edema in intraorbital tissues.
• Magnetic resonance imaging (MRI) may detect these changes.

Purpose of the Study:

• To investigate MRI-detectable edema in orbital tissues after blowout fractures.
• To assess changes in extraocular muscles (EOMs) and orbital fat volume and characteristics.

Main Methods:

• 18 patients with blowout fractures underwent serial MRI scans (within 72 hours and 10-14 days post-trauma).
• Measurements of EOMs and orbital fat were compared between fractured and unfractured orbits.
• Changes in muscle volume, cross-sectional area, and mean grey value (MGV) were analyzed.

Main Results:

• Significantly increased EOM volume, cross-sectional area, and MGV were observed in the fractured orbit compared to the unfractured side.
• These significant differences diminished by the second scan.
• Herniated orbital content volume decreased significantly between the first and second scans.

Conclusions:

• Post-traumatic edema in intraorbital soft tissues is detectable by MRI and subsides within two weeks.
• The findings support a watchful waiting approach for blowout fractures without muscle entrapment.