MRI OF IDIOPATHIC ORBITAL INFLAMMATORY SYNDROME USING FAT-SATURATION AND GD-DTPA

Idiopathic orbital inflammatory syndrome encompasses a group of inflam matory conditions for which no systemic or local cause can be found, a nd is commonly re ferred to as orbital pseudotumour. On conventional M RI sequences subtle areas of inflammation or enhancing tissue can easi ly be masked by the high signal intensity of orbital fat and involveme nt of the fat itself may not be appreciated. We describe the MRI featu res of three patients with idiopathic orbital inflammation using frequ ency-selective fat saturation and Gd-DTPA.