A<unk> is a rare, fluid-filled neuroglial cavity within the spinal cord <unk> omyelia), in the brain stem <unk> obulbia), or in the nerves of the elbow, usually in a young age.
Syrinx 
Optician
Optic stalk
Optic recess
Ateronon
Microgyrus
Cauliflower ear
Otic vesicle