This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: C.V.S, Subject name: Medicine
Normal PCWP with pulmonary oedema is seen in 
Select and explain. 
A. Left atrial myxoma, B. High altitude, C. Pulmonary vein obstruction, D. Pulmonary aery obstruction
B: High altitude
Answer: B: High altitude 
Explanation: Ref Harrison 19 th ed pg 1763 The use of a Swan-Ganz catheter permits measurement of PCWP and helps differentiate high-pressure (cardiogenic) from normal- pressure (noncardiogenic) causes of pulmonary edema. High altitude has been grouped together as one of the miscellaneous causes for ARDS reflecting pulmonary oedema with a normal PCWP