Polycythemia
What is Polycythemia? Polycythemia, also known as erythrocytosis, means that there are too many red blood …
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Polyarteritis Nodosa
What is Polyarteritis Nodosa? Polyarteritis nodosa, or PAN, is a severe type of vasculitis, a condition …
Poliomyelitis
What is Poliomyelitis? Polio, short for poliomyelitis, is a contagious disease that spreads when people come …
Poland Syndrome
What is Poland Syndrome? Poland syndrome is a condition that can cause several different problems with …
Poikilocytosis
What is Poikilocytosis? Poikilocytosis describes a condition where the shapes of red blood cells (RBCs) in …
Pneumothorax
What is Pneumothorax? A pneumothorax, or collapsed lung, happens when air gets trapped in the space …
Pneumonia Pathology
What is Pneumonia Pathology? Pneumonia is an infection in the lungs. But it’s important to recognize …
Pneumomediastinum (Mediastinal emphysema)
What is Pneumomediastinum (Mediastinal emphysema)? Pneumomediastinum, also known less commonly as mediastinal emphysema, refers to the …
Pneumocystis jirovecii Pneumonia
What is Pneumocystis jirovecii Pneumonia? Pneumocystis carinii pneumonia (PCP), now called Pneumocystis jirovecii pneumonia, is a …