Coloured computed tomography (CT) scan moving from the base to the top of the head of a patient with an antrochoanal polyp affecting their right nostril. This a benign (non-cancerous) growth on the maxillary sinus, behind the nose. It can cause obstruction of the airways, discomfort, and continual discharge of thin mucus (rhinorrhoea). Treatment is typically surgical removal.

Coloured computed tomography (CT) scan moving from the base to the top of the head of a patient with an antrochoanal polyp affecting their right nostril. This a benign (non-cancerous) growth on the maxillary sinus, behind the nose. It can cause obstruction of the airways, discomfort, and continual discharge of thin mucus (rhinorrhoea). Treatment is typically surgical removal.