Fig. 9
From: Intruding implements: a pictorial review of retained surgical foreign objects in neuroradiology
Silicon oil migration. Axial T1-weighted (a, b) and coronal T2-weighted (c, d) images demonstrating migration of silicon oil used to treat right retinal detachment (asterisk in a) through the right optic nerve sheath up to the right half of the optic chiasm (arrow in b, c, and d). The migrated material has heterogeneous signal also due to chemical shift artifact