[Mucopyocele of the ethmoidal labyrinth].

An isolated affection of a single sinus is a rare occurrence in patients presenting with chronic sinusitis (especially in children). Clinically, chronic ethmoiditis usually has the form of a cattarhal (not infrequently latent) inflammatory process. When the opening of the sinus is closed during a long time, its accumulated contents cause the bone walls to distend and become thinner. A large amount of mucous exudate leads to the development of mucocele (pyocele). A case of mucopyocele in the ethmoidal labyrinth in a 7 year-old girl is reported in conjunction with the results of its treatment.