Pneumosinus dilatans refers to an isolated enlarged aerated paranasal sinus (hyperpneumatisation) with intact bony walls and bony septae. It is most commonly seen in frontal sinuses. It is a normal variant and usually asymptomatic with incidental discovery.

A pineal cyst is also an incidental finding. Here it shows typical appearance with fluid content similar to CSF. It can show variable T1 signal according to its content. Cystic pineocytoma may have similar imaging appearance and follow up is recommended for cysts larger than 10 mm.