An Official Website of the Commonwealth of Kentucky
Note the meningeal worm in the meninges inside the skull.
Meningeal worm is caused by the roundworm (nematode)Parelaphostrongylus tenuis. The intermediate host is one of several species of snail or slug. Animals become infected when they ingest infected snails or slugs, likely by accident.
Symptoms of the disease are:
The roundworm infects the area in or around the brain and spinal cord. Microscopic examination can find “tracks” of the worm moving through these areas. Occasionally, a thin, hair-like worm can be found in the area surrounding the brain.
Diagnosis is made by finding “tracks” the worm has left through the spinal cord or brain, usually only visible under a microscope. Additionally, the thin, hair-like worm can be found in the meninges between the brain and skull.