If you've been diagnosed with pulmonary arterial hypertension (PAH)--high blood pressure in the arteries of your lungs--and it hasn't responded to treatment, you may have a special subtype of PAH called pulmonary veno-occlusive disease, or PVOD. Find out why researchers in Australia say that people with PVOD are frequently misdiagnosed--and what the underlying signs are. Read more - http://www.eurekalert.org/pub_releases/2009-06/acoc-nbf060409.php