What is polyarteritis nodosa Polyarteritis nodosa is a serious but rare form of inflammation of blood vessels (vasculitis) that involves small and medium-sized arteries where

What is serum osmolality Osmolality is a measure of the number of dissolved particles in a fluid. A test for osmolality measures the amount of

What is pneumomediastinum Pneumomediastinum also known as mediastinal emphysema is an uncommon and usually a self-limited condition where there is air in the mediastinum ((Iteen AJ,

What is pericardiocentesis Pericardiocentesis is a procedure that uses a needle to remove fluid from the pericardial sac that surrounds your heart. Pericardiocentesis may be

What is parathyroid adenoma A parathyroid adenoma is a noncancerous (benign) tumor of the parathyroid glands. The parathyroid glands are located in the neck, near

What is a pancreatic pseudocyst Pancreatic pseudocyst is best defined as localized fluid collection arising from the pancreas that are rich in pancreatic juice containing

What is osmotic diuresis Osmotic diuresis is increased urination due to the presence of certain substances in the filtered fluid by the kidneys. This fluid

What is neurosarcoidosis Neurosarcoidosis is a manifestation of sarcoidosis in the nervous system. Sarcoidosis is a chronic inflammatory disorder that typically occurs in adults between

What is neurosyphilis Neurosyphilis is a Treponema pallidum bacteria infection of the coverings of the brain, the brain itself or the spinal cord, that usually

What is neonatal abstinence syndrome Neonatal Abstinence Syndrome (NAS) refers to symptoms of withdrawal that babies can develop after birth if their mothers have taken