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Perineural cysts, which are also known as Tarlov cysts, are fluid-filled sacs that form on nerves at the base of the spine. A person with such cysts would likely never know it. They almost never cause symptoms. When they do cause symptoms, however, the most common is pain in the lower back, buttocks, and legs.
Geode (or subchondral cyst) is a well-defined lytic lesion in the periarticular surfaces.A geode is one of the common differential diagnoses of an epiphyseal lesions (lytic). This is originally a geological term referring to rounded formations in igneous and sedimentary rocks.resumably, one method of geode formation takes place when synovial fluid is forced into the subchondral bone, causing a cystic collection of joint fluid. Another aetiology is following a bone contusion, in which the contused bone forms a cyst.