Editing Retrograde amnesia (section)

=== Surgery ===
[[Henry Molaison]] had epilepsy that progressed and worsened by his late twenties. The severity of his condition caused him to undergo surgery in an effort to prevent his seizures. Unfortunately, due to a lack of overall known neurological knowledge, Molaison's surgeons removed his bilateral medial temporal lobe, causing profound AA and RA.<ref name="HMpap">{{cite journal | vauthors = Squire LR | title = The legacy of patient H.M. for neuroscience | journal = Neuron | volume = 61 | issue = 1 | pages = 6–9 | date = January 2009 | pmid = 19146808 | doi = 10.1016/j.neuron.2008.12.023 | pmc = 2649674 | s2cid = 643599 }}</ref> The removed brain structures included the hippocampus, the amygdala, and the [[parahippocampal gyrus]], now called the medial temporal lobe memory system.<ref name="HMpap"/> HM was one of the most studied memory cases to date and started the examination of neurological structures in relation to memory.

Patients who have RA due to surgery are "P.B." and "F.C." who had unilateral removal of the medial areas in the left temporal lobe.<ref name="HMpap"/>