Tibial Tunnel Cyst

About diagnostic imaging of postoperative complication of anterior cruciate ligament (ACL) reconstruction.

This is the case of a patient the came to my observation for a palpable mass into the anterior-medial pretibial region, two years after ACL reconstruction.

Tunnel cyst formation is a rare complication after ACL reconstruction, usually occurring 1-5 years post-operatively, which may occasionally be symptomatic. The ultrasound exam in this case is not enough. The study is completed with MRI and Cone-Beam CT examination.

Tibial Tunnel Cyst MRI

MRI-Cone-Beam CT

Why Cone-Beam CT? Same diagnostic capability of total-body CT but low radiation dose!

Low Radiation Dose

The computed tomography dose index (CTDI) is a commonly used radiation exposure index in X-ray computed tomography (CT); in this case 4,74 mGy was the value detected. 16.98 mGy is the estimated absorbed dose by using a total-body CT scan for the same examination.

Total-Body CT

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Dynamic MSK Imaging of Metacarpal Fracture

About dynamic msk imaging modalities in the study of post-traumatic metacarpal fracture

4th metacarpal fracture

Acute 4th metacarpal spiroid fracture of a professional football goalkeeper; first diagnosis was made directly on pitch with an ultrasound examination. Plain radiographs and Mri exam were performed just one hour after trauma.

One month after surgical fixation the fracture is studied with dynamic US, Mri and Cone-Beam CT imaging. The US and MR dynamic evaluations, show a regular tendon sliding over the fixation devices.

No metal-induced artifacts were seen, allowing a perfect visualization of the implanted devices.

CBCT Reconstruction

Cone-Beam CT Sagittal (left) and Coronal (right) reconstructions.

The study was completed with dynamic Mri (0.3 Tesla) and Cone-Beam CT scans, performed with active flexion-extension of carpal-metacarpal joint structures.