Inflammation of an antrum, particularly inflammation of the maxillary antrum (a sinus cavity in the cheekbone).
From 'antrum' + '-itis' (inflammation, from Greek). This medical diagnostic term became standard in 19th-century pathology as doctors developed terminology for identifying inflamed anatomical structures.
Maxillary antritis is essentially acute sinusitis, and it's so common that most people experience it at least once during a severe cold or flu—your sinuses fill with fluid and the pressure causes that miserable facial pain.
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