Note: This case has been tagged as "legacy" as it no longer meets image preparation and/or other case publication guidelines.
From the case:
Tectal plate lipoma
{"current_user":null,"step_through_annotations":true,"access":{"can_edit":false,"can_download":true,"can_toggle_annotations":true,"can_feature":false,"can_examine_pipeline_reports":false,"can_pin":false},"extraPropsURL":"/studies/8818/annotated_viewer_json?c=1669162098\u0026lang=us"}
A focal region of fat is demonstrated in the quadrigeminal (tectal plate) cistern consistent with a lipoma.
Case Discussion
Lipomas are easily identified on CT but may also be mistaken for CSF or air depending on the windowing values. They typically have Hounsfield values between -20 to -100 HU (depending on size / partial voluming). CSF would have values close to 0 HU while air would be below -800 HU.
Unable to process the form. Check for errors and try again.