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Click Digital PA and lateral radiographs of the chest from a 41 year old female with a soft tissue aneurysmal bone cyst. The radiograph was acquired on a GE® CR digital radiography unit. The x-ray tube was set for 125 kVp, however exact mAs is not known since this setting was not embedded into our digital radiographs at the time of acquisition.
Radiographs of the chest obtained at the patient’s initial presentation to the Emergency Department showed no acute cardiopulmonary process.


Click Digital radiographs from a 41 year old female with a soft tissue aneurysmal bone cyst. The radiographs were acquired on a GE® CR digital radiography unit. The x-ray tube was set for 70 kVp, however exact mAs is not known since this setting was not embedded into our digital radiographs at the time of acquisition.
Radiographs of the left shoulder obtained at the patient’s initial presentation to the Emergency Department showed no acute pathology. No mass was seen at that time.


Click Digital radiographs from a 41 year old female with a soft tissue aneurysmal bone cyst. The radiographs were acquired on a GE® CR digital radiography unit. The x-ray tube was set for 70 kVp, however exact mAs is not known since this setting was not embedded into our digital radiographs at the time of acquisition.
Radiographs of the left shoulder obtained 4 months after the patient’s initial presentation showed interim development of a 7.0 (transverse) cm x 5.5 (anteroposterior) cm x 6.7 cm (craniocaudad) cm peripherally calcified mass in the region of the posterior deltoid/upper triceps muscles.


Click Axial CT images from a 41 year old female with a soft tissue aneurysmal bone cyst. The CT was performed on a GE® 64-slice CT scanner. All images are from a non-contrast chest CT (thus the incomplete inclusion of the lesion) obtained 4 days after discovery of the calcified mass in the soft tissues of the left shoulder. The images are shown using a standard soft tissue window (width = 350, center = 40). 5mm slices were acquired, using standard soft tissue algorithm. 120 kVp was used with variable mAs, which ranged from 292 mAs to 457 mAs for the provided axial images.
Axial images from non-contrast chest CT using soft tissue window showed a 7.0 (transverse) cm x 5.5 (anteroposterior) cm x 6.7 cm (craniocaudad) cm mass with rim calcification in the region of the posterior deltoid/upper triceps muscles. A few thin calcified septations were also seen. Hypodense areas could be seen in the lesion, suggesting the underlying blood filled cystic spaces characteristic of an aneurysmal bone cyst.

Click Axial CT images from a 41 year old female with a soft tissue aneurysmal bone cyst. The CT was performed on a GE® 64-slice CT scanner. All images are from a non-contrast chest CT (thus the incomplete inclusion of the lesion) obtained 4 days after discovery of the calcified mass in the soft tissues of the left shoulder. The images are shown using soft tissue windows (width = 350, center = 40). 1.25 mm slices were acquired, using edge-enhanced lung algorithm. 120 kVp was used with variable mAs, which ranged from 292 mAs to 457 mAs for the provided axial images.
Axial images from non-contrast chest CT using soft tissue window showed a 7.0 (transverse) cm x 5.5 (anteroposterior) cm x 6.7 cm (craniocaudad) cm mass with rim calcification in the region of the posterior deltoid/upper triceps muscles. A few thin calcified septations were also seen. Hypodense areas could be seen in the lesion, suggesting the underlying blood filled cystic spaces characteristic of an aneurysmal bone cyst.

Click Axial CT images from a 41 year old female with a soft tissue aneurysmal bone cyst. The CT was performed on a GE® 64-slice CT scanner. All images are from a non-contrast chest CT (thus the incomplete inclusion of the lesion) obtained 4 days after discovery of the calcified mass in the soft tissues of the left shoulder. The images are shown using lung windows (width = 1500, center = -600). 1.25 mm slices were acquired, using edge-enhanced lung algorithm. 120 kVp was used with variable mAs, which ranged from 292 mAs to 457 mAs for the provided axial images.
Axial images from non-contrast chest CT using lung window shows no mass, significant nodule, or other acute pathology in the lungs. The 7.0 (transverse) cm x 5.5 (anteroposterior) cm x 6.7 cm (craniocaudad) cm mass with rim calcification in the region of the posterior deltoid/upper triceps muscles is suboptimally visualized due to window settings.

Click Noncontrast T1 weighted fat suppressed axial MR images (TR=720.0, TE=9.1, FA=170.0) of the left shoulder from a 41 year old female with a soft tissue aneurysmal bone cyst. Images were 5 days after discovery of a calcified mass in the soft tissues of the left shoulder. Specifics about MR scanner type were not available since the study was performed at an outside institution. A 6.8 (transverse) cm x 5.9 (anteroposterior) cm x 7.0 cm (craniocaudad) cm well-circumscribed mass with hypointense capsule/septations and multiple fluid-fluid levels was seen. No bony invasion was appreciated.

Click Proton density axial MR images (TR=3500.0, TE=33.0, FA=160.0) of the left shoulder from a 41 year old female with a soft tissue aneurysmal bone cyst. Images were acquired 5 days after discovery of a calcified mass in the soft tissues of the left shoulder. Specifics about MR scanner type were not available since the study was performed at an outside institution. A 6.8 (transverse) cm x 5.9 (anteroposterior) cm x 7.0 cm (craniocaudad) cm well-circumscribed mass with hypointense capsule/septations and multiple fluid-fluid levels was seen, with improved visualization compared to T1 weighted images.

Click T2 weighted axial MR images (TR=577.0, TE=15.0, FA=30.0) of the left shoulder from a 41 year old female with a soft tissue aneurysmal bone cyst. Images were acquired 5 days after discovery of a calcified mass in the soft tissues of the left shoulder. Specifics about MR scanner type were not available since the study was performed at an outside institution. A 6.8 (transverse) cm x 5.9 (anteroposterior) cm x 7.0 cm (craniocaudad) cm well-circumscribed mass with hypointense capsule/septations and multiple fluid-fluid levels from hematocrit layering in the blood-filled cystic spaces.

Click Post-contrast T1-weighted fat suppressed axial MR images (TR=720.0, TE=9.1, FA=170.0) of the left shoulder from a 41 year old female with a soft tissue aneurysmal bone cyst. Images were acquired 5 days after discovery of a calcified mass in the soft tissues of the left shoulder. Specifics about MR scanner type and contrast amount were not available since the study was performed at an outside institution. A 6.8 (transverse) cm x 5.9 (anteroposterior) cm x 7.0 cm (craniocaudad) cm well-circumscribed mass with avid enhancement of the soft tissue aneurysmal bone cyst fibrous capsule and septations in a “honeycomb” appearance was seen. There was no enhancement of the blood filled cystic spaces themselves. Fluid-fluid levels were again seen.

Click Proton density fat suppressed sagittal MR images (TR=3100.0, TE=42.0, FA=150.0) of the left shoulder from a 41 year old female with a soft tissue aneurysmal bone cyst. Images were acquired 5 days after discovery of a calcified mass in the soft tissues of the left shoulder. Specifics about MR scanner type were not available since the study was performed at an outside institution. A 6.8 (transverse) cm x 5.9 (anteroposterior) cm x 7.0 cm (craniocaudad) cm well-circumscribed mass with hypointense capsule/septations and multiple fluid-fluid levels. Edema was seen in the adjacent triceps and deltoid musculature.

Click Post-contrast T1-weighted fat suppressed sagittal MR images (TR=701.1, TE=11.0, FA=160.0) of the left shoulder from a 41 year old female with a soft tissue aneurysmal bone cyst. Images were acquired 5 days after discovery of a calcified mass in the soft tissues of the left shoulder. Specifics about MR scanner type and contrast amount were not available since the study was performed at an outside institution. A 6.8 (transverse) cm x 5.9 (anteroposterior) cm x 7.0 cm (craniocaudad) cm well-circumscribed mass with avid enhancement of the soft tissue aneurysmal bone cyst fibrous capsule and septations in a “honeycomb” appearance was seen. There was no enhancement of the blood filled cystic spaces themselves. Fluid-fluid levels were again seen.

Click Noncontrast T1 weighted fat suppressed oblique coronal MR images (TR=600.0, TE=11.0, FA=150.0) of the left shoulder from a 41 year old female with a soft tissue aneurysmal bone cyst. Images were acquired 5 days after discovery of a calcified mass in the soft tissues of the left shoulder. Specifics about MR scanner type were not available since the study was performed at an outside institution. A 6.8 (transverse) cm x 5.9 (anteroposterior) cm x 7.0 cm (craniocaudad) cm well-circumscribed mass with hypointense capsule/septations was seen. Due to the oblique coronal axis, fluid-fluid levels are not as well visualized as they are in the axial and sagittal planes.

Click Post-contrast T1 weighted fat suppressed oblique coronal MR images (TR=625.0, TE=9.1, FA=122.0) of the left shoulder from a 41 year old female with a soft tissue aneurysmal bone cyst. Images were acquired 5 days after discovery of a calcified mass in the soft tissues of the left shoulder. Specifics about MR scanner type and contrast amount were not available since the study was performed at an outside institution. The images were obtained 5 days after discovery of a calcified mass in the soft tissues of the left shoulder. A 6.8 (transverse) cm x 5.9 (anteroposterior) cm x 7.0 cm (craniocaudad) cm well-circumscribed mass with avid enhancement of the soft tissue aneurysmal bone cyst fibrous capsule and septations in a “honeycomb” appearance was seen. There was no enhancement of the blood filled cystic spaces themselves. Due to the oblique coronal axis, fluid-fluid levels are not as well visualized as they are in the axial and sagittal planes.

Click Proton density oblique coronal MR images (TR=4000.0, TE=36.0, FA=150.0) of the left shoulder from a 41 year old female with a soft tissue aneurysmal bone cyst. Images were acquired 5 days after discovery of a calcified mass in the soft tissues of the left shoulder. Specifics about MR scanner type were not available since the study was performed at an outside institution. A 6.8 (transverse) cm x 5.9 (anteroposterior) cm x 7.0 cm (craniocaudad) cm well-circumscribed mass with hypointense capsule/septations was seen. Multiple fluid-fluid levels are present, but not as well appreciated as on the proton density sequences in the sagittal and axial planes.