From the case:
Swan (illustration)
{"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/141955/annotated_viewer_json?lang=gb"}
A person with inflammatory arthritis may have hyperextension of a proximal interphalangeal (PIP) joint and flexion of a distal interphalangeal (DIP) joint giving the finger a shape reminiscent of a swan's neck.
Case Discussion
Image generated with Midjourney.com by Frank Gaillard.