Retrobulbar space imaging examines the area behind the globe within the orbit, including fat, muscles, vessels, and optic nerve. It helps investigate causes of proptosis, pain, or visual disturbance.
Techniques
CT and MRI are the main modalities, providing complementary views of soft tissues and bone. Ultrasound may also visualise retrobulbar masses or haemorrhage in selected cases.
- MRI offers excellent soft tissue contrast for muscles, nerves, and tumours
- CT is superior for fractures, calcification, and acute haemorrhage
- Cross-sectional imaging defines lesion size, extent, and relation to vital structures
- Contrast agents enhance vascular lesions and inflammation
Clinical Uses
Retrobulbar imaging is vital in diagnosing thyroid eye disease, orbital tumours, inflammatory conditions, and trauma. It guides medical and surgical management.
- Reveals muscle enlargement patterns typical of thyroid eye disease
- Distinguishes inflammatory pseudotumour from neoplastic masses
- Identifies retrobulbar haemorrhage requiring urgent decompression
- Findings are integrated with clinical signs such as proptosis and motility restriction
