A fistula tract has developed through the floor of the right frontal sinus at the site of a previous frontal sinus trephine performed for the treatment of a frontal sinus mucocele. As the obstruction of the frontal recess was not treated, the mucocele properly recurred, became infected and drained through the site of the previous trephination. Courtesy of Professor Heinz Stammberger, University of Graz, Austria.
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