Hi dr. what is the difference between a simple pineal cyst and a complex pineal cyst. looks like my mri showed a 1.3 cm complex pineal cyst. thank you?

Liquid vs other stuf: A simple cyst generally contains only fluid. A complex cyst is a sac that contains mostly fluid (liquid) but also some material - cells / tissue or colloid or something solid - inside. That solid material makes its appearance different than just a fluid-filled sac. Larger (> 1cm) cysts in the pineal gland can't be distinguished from cystic tumors & so repeated scans are generally the rule. TTYD.