Foster Kennedy syndrome

Foster Kennedy Syndrome is a paraneoplastic syndrome. It can be caused by any tumor of the frontal lobe.It is characterized by four symptoms:
# Damage to the optic nerve on the same side as the tumor.
# Edema in the disc of the eye on the opposite side of the tumor
# Loss of central vision in the eye on the same side of the tumor
# Loss of the sense of smell on the same side as the tumor
The only treatment of the condition is to treat the underlying tumor.
Foster Kennedy Syndrome at Wikipedia