16 cysts,nodules or masses showed homogeneous density. Enhanced scanning showed no enhancement in 7 patients,thin-wall enhancement in 5,thick-wall enhancement in 4.Pathologically,the non-enhanced areas were mucus,pus,or glutinous fluid.

• 16例非含气囊肿平扫密度均匀 ,增强扫描 7例无明显强化、5例为薄壁环形强化、4例为厚壁周围性强化。 无强化区的病理成分为粘液、脓液或胶样液体。