1. pleuritis -- Information from Healthwise
The inflammation of the pleura sometimes causes fluid to build up in the pleural cavity ( pleural effusion ). Since many different health problems can lead to pleurisy, your doctor will look for what is causing your inflammation.
http://www.everettclinic.com/kbase/topic/special/tj8148/sec1.htm

2. Pericarditis -- Information from Health A to Z
Pericarditis is an inflammation of the two layers of the thin, sac-like membrane that surrounds the heart. This membrane is called the pericardium, so the term pericarditis means inflammation of the pericardium.
http://www.healthatoz.com/healthatoz/Atoz/ency/pericarditis.jsp

3. Pericarditis -- Mayo Clinic
Pericarditis, a condition that can cause chest pain, occurs when the sac that envelops the heart becomes inflamed. Treatment often includes anti-inflammatory drugs. Pericarditis is a swelling and irritation of the pericardium, the thin sac-like...
http://www.mayoclinic.com/invoke.cfm?objectid=CE3BC2CF-B4C1-4401-8F0F9E0B7C2845...