Oh... and did I forget to mention the VA Watchdog contains some very interesting aspects on this, even the resignation of a US Government official for telling the big lie that PTSD is curable... and this caused his resignation as it is a lie... http://www.vawatchdog.org/07/nf07/nfSEP07/nf091607-11.htm
Every professional mental health organisation and physician will typically only ever use the word "treatable" for PTSD. There are people who have the types confused, ie. acute is curable and chronic is not. Not so... both are not curable, as both are PTSD. What they usually mean, is that Post Traumatic Stress (Acute Stress Disorder (ASD) and often also referred as Post Traumatic Stress Syndrome (PTSS)) is very curable, because there is nothing to cure as no actual chemical imbalance has taken place.
People think it is about the hippocampus... its not. An MRI can show hippocampal change, however; it is shown that people with both ASD and PTSD can endure hippocampal reduction. One will recover with zero symptoms, the other will never fully recover. A person with PTSD can recover their hippocampal size, beinge their ability for memory capacity. This is done with different therapies, ie. reading is a big one.
If you want to really get authoritative information, do what I and others do, subscribe to the relevant journals, ie. ISTSS http://www.istss.org, http://ajp.psychiatryonline.org, http://bjp.rcpsych.org and a good list of journals at http://www.psychwatch.com/psychiatry_journals.htm.
There are lots, and the majority of content within the information section, being authoritive content, is structured from these such documents, physicians, therapists, mental health professionals, etc.