Ethmoiditis is an inflammation of the ethmoidal cells in the sinuses, the air-filled cavities behind the nose and between the eyes.
See also: Sinusitis
Symptoms usually include a headache between the eyes and a runny nose.
Symptoms of more serious infections can include loss of vision, double vision, or redness or bulging of the eyes (orbital cellulitis).
Ferguson BJ, Johnson JT. Infectious causes of rhinosinusitis. In: Cummings CW, Flint PW, Haughey BH, Robbins KT, Thomas JR, eds. . 4th ed. Philadelphia, Pa: Mosby Elsevier; 2005:chap 50.
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