Artigo em Inglês:
Tarlov's original description of perineurial cysts was reported in 1938 and based on observations made during dissection of 30 cadaveric terminal filum specimens at the Montreal Neurological Institute. He noted extradural cysts, often multiple, on portions of the posterior sacral and coccygeal nerve roots in five of these specimens. On histological examination, he found that these cysts were located in the perineurial space, between the endo-and perineurium at the junction of the posterior nerve root and its ganglion. In his original description, Tarlov discovered inflammatory cells in some cyst walls and adjacent tissues, leading him to postulate that these cysts were formed by a process of inflammation within the nerve root sheath, followed by inoculation of fluid.
Tarlov cysts are spinal nerve root lesions filled with spinal fluid, found most often at the lower levels of the spine. Other names for Tarlov and related spinal cysts are perineural or perineurial cyst, meningeal cyst, and arachnoid cyst. These cysts typically occur along the posterior nerve roots. The main feature that distinguishes Tarlov cysts from other spinal lesions is the presence of spinal nerve root fibers within the cyst wall, or in the cyst cavity itself.