Tapeworm cyst in a sheep brain

Photograph of the brain from a sheep viewed from the top. A tapeworm cyst (brown) is visible in the brain. This cyst is part of the life cycle of the tapeworm Taenia multiceps, found in the small intestine of the dog. The presence of the cyst, near to the cerebellum, may result in sheep exhibiting a circling or high-stepping gait. Each cream-coloured 'spot' on the cyst wall is an immature tapeworm head that will develop into a fully-grown tapeworm, up to a metre long, in the small intestine of a dog.