Subacute combined degeneration of spinal cord, also known as Lichtheim's disease, refers to degeneration of the posterior and lateral columns of the spinal cord as a result of vitamin B12 deficiency (most common), vitamin E deficiency, and copper deficiency. It is usually associated with pernicious anemia.
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http://jnnp.bmj.com/content/65/6/822.fullj neurol neurosurg psychiatry 1998;65:822-827 doi:10.1136/jnnp.65.6.822 paper :subacute combined degeneration: clinical, electrophysiological, and magnetic resonance imaging findings by b hemmer,f x glocker,m schumacher,g deuschl,c h lücking
https://www.hindawi.com/journals/crinm/2013/159649/ azize esra gürsoy, mehmet kolukisa, gülsen babacan-yildiz, and arif çelebi, “subacute combined degeneration of the spinal cord due to different etiologies and improvement of mri findings,” case reports in neurological medicine, vol. 2013, article id 159649, 5 pages, 2013. doi:10.1155/2013/159649
https://www.ncbi.nlm.nih.gov/pmc/articles/pmc1831618/ vasconcelos om, poehm eh, mccarter rj, campbell ww, quezado zmn. potential outcome factors in subacute combined degeneration: review of observational studies. journal of general internal medicine. 2006;21(10):1063-1068. doi:10.1111/j.1525-1497.2006.00525.x.
http://www.neuroanatomy.wisc.edu/selflearn/scd.htm european journal of neurology
volume 9 issue 1 page 101 - january 2002 doi:10.1046/j.1468-1331.2002.00336.x mr findings in subacute combined degeneration of the spinal cord caused by nitrous oxide anaesthesia - two cases by s. ilniczky et al.,
pendse n a, bafna p. subacute combined degeneration of cord (scd ) - case report and review of literature. indian j radiol imaging [serial online] 2003 [cited 2017 jan 26];13:431-2. available from: http://www.ijri.org/text.asp?2003/13/4/431/28728
srikanth s g, jayakumar p n, vasudev m k, taly a b, chandrashekar h s. mri in subacute combined degeneration of spinal cord : a case report and review of literature. neurol india [serial online] 2002 [cited 2017 jan 26];50:310. available from: http://www.neurologyindia.com/text.asp?2002/50/3/310/1435