From the case:
Monod sign (aspergilloma)
{"current_user":null,"step_through_annotations":true,"access":{"can_edit":false,"can_download":true,"can_toggle_annotations":true,"can_feature":false,"can_pin":false},"extraPropsURL":"/studies/9488/annotated_viewer_json?lang=us"}
Single zoomed image of a CT of the chest demonstrating an aspergilloma in a pre-existing lung cavity; this is known as Monod's sign of fungus ball.