Society and culture
Economics
In 2015, the cost of treatment with efinaconazole in the United States was said to be US$2,307 per nail.In 2019, a study by the Canadian Agency for Drugs and Technologies in Health found the cost for a 48-week course to be $178 for a big toe, and $89 for an other toe. References
External links
"Efinaconazole". Drug Information Portal. U.S. National Library of Medicine.
Spinal dermoid cysts
Spinal dermoid cysts are benign ectopic growths thought to be a consequence of embryology errors during neural tube closure. Their reported incidence is extremely rare, accounting for less than 1% of intramedullary spinal cord tumours. It has been proposed that a possible 180 cases of spinal dermoid tumours have been identified over the past century in the literature.Dermoid cysts more often involve the lumbosacral region than the thoracic vertebrae and are extramedullary presenting in the first decade of life. Various hypotheses have been advanced to explain the pathogenesis of spinal dermoids, the origin of which may be acquired or congenital. Acquired or iatrogenic dermoids may arise from the implantation of epidermal tissue into the subdural space i.e. spinal cutaneous inclusion, during needle puncture (e.g. lumbar puncture) or during surgical procedures on closure of a dysraphic malformation. Congenital dermoids, however, are thought to arise from cells whose position is correct but which fail to differentiate into the correct cell-type. The long-time held belief was that the inclusion of cutaneous ectodermal cells occurred early in embryonic life, and the displaced pluripotent cells developed into a dermoid lesion.Spinal abnormalities, e.g. intramedullary dermoid cysts may arise more frequently in the lumbosacral region (quite often at the level of the conus medullaris) and may be seen with other congenital anomalies of the spine including posterior spina bifida occulta as identified by the neuroradiological analysis. Diagnosis
Differential diagnosis
A small dermoid cyst on the  coccyx can be difficult to distinguish from a pilonidal cyst.