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A 26-year-old Japanese man visited our clinic because of a huge forehead protrusion (fig 1A) with acute onset. He was under treatment for asthma, nasal allergies and chronic bronchitis. CT and MRI images revealed erosive defects at the inner and outer layers of the frontal bone and communication between the frontal sinus and both the subcutaneous space (fig 1B,D) and the epidural space (fig 1C,E), suggesting a frontal mucocele resulting in a subcutaneous abscess and epidural extension (arrowhead).
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