Popliteal pseudoaneurysm secondary to a tibial osteochondroma: diagnosis with multi-detector row computed tomographic angiography.

A 17-year-old male presented with right knee pain following mild trauma whilst playing badminton. He subsequently developed a popliteal pseudoaneurysm secondary to trauma from a tibial osteochondroma. This is a recognised though very rare occurrence. Its appearance is reported for the first time using multidetector row computed tomographic angiography (MDCTA). The clinical presentation and management of the popliteal pseudoaneurysm are outlined and the imaging findings are illustrated. There is increasing usefulness of MDCTA as an accessible, accurate, noninvasive clinical tool in the emergency diagnostic setting. Its use in the management of this unusual condition is demonstrated with emphasis on 3D, multi-planar reconstruction post-processing techniques.