The terminal ventricle (ventriculus terminalis, or fifth ventricle) is widest part of the central canal of the spinal cord that is located at or near the conus terminalis.  It was described by Stilling in 1859 and Krause in 1875.  Krause introduced the term fifth ventricle after observation of normal ependymal cells.  The central canal expands as a fusiform terminal ventricle, and approximately 8-10 mm in length in the conus medullaris (or conus terminalis).  Although the terminal ventricle is visible in the fetus and children, but is usually absent in adults. 
In pathological conditions, an MRI is usefulat at the level of the conus medullaris that findings may be related to the following:
In some cases, the terminal ventricle may cause clinical symptoms due to its expansion.
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