Presentation
6 year old girl post fall. She injured her left humerus 2 days ago, and has ongoing shoulder/proximal humerus pain since. Restricted motion of the shoulder joint. No neurovascular deficit.
Patient Data
Age: 6 years
Gender: Female
From the case:
Fallen fragment sign of unicameral bone cyst
{"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/61491/annotated_viewer_json?lang=us"}
Slightly expansile, lucent lesion in the proximal humeral diaphysis with lateral cortical break in keeping with an acute pathological fracture. A fallen bone fragment is seen within the lesion.
From the case:
Fallen fragment sign of unicameral bone cyst
{"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/61492/annotated_viewer_json?lang=us"}
Annotated fallen fragment sign (arrow).
Case Discussion
The fallen fragment sign is virtually pathognomonic for a unicameral simple bone cyst, however, there are a few case reports in the literature that report this sign in other cystic bone lesions e.g. eosinophilic granuloma 1.
Unable to process the form. Check for errors and try again.