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A case of concha pyocele (concha bullosa mucocele) mimicking intranasal mass. Concha bullosa is the most common anatomic variant of the middle turbinate that usually remains asymptomatic. If the mucosal lining of pneumatized middle turbinate becomes inflamed, symptoms such as nasal obstruction, post-nasal discharge, snoring, headache, and fever occur. We report a case of concha pyocele (concha bullosa mucocele) in a 19-year-old girl. Computed tomography identified a right intranasal mass expanding towards the medial wall of the right maxillary sinus, nasal septum and right ethmoidal cells. The concha pyocele caused obstruction of the ostiomeatal complex, leading to right maxillary, ethmoid and sfenoid sinusitis. The patient was endoscopically treated under local anaesthesia. Histological examination of the mass revealed an active chronic inflammation caused by a foreign body.