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Musculoskeletal Imaging

Aneurysm

a dilated portion of an artery, vein or heart forming a sac filled with fluid or clotted blood, which often forms a pulsating tumour. For a general description, see aneurysm.

Angiography is the imaging method used for planning surgery of an aneurysm or pseudoaneurysm, although MR imaging and ultrasonography may be employed in diagnosis. Popliteal aneurysms are common, producing a mass in the popliteal space that may be mistaken for a soft tissue tumour or popliteal cyst (Fig.1). Arterial aneurysms may also develop in the knee in association with an osteochondroma.

Several other varieties of aneurysm (cirsoid, venous racemose) are considered benign types of angiomatosis.

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Fig.1

Sagittal T1-weighted (a), axial multiplanar gradient-echo (b), and axial T2-weighted (c) MR images of the knee demonstrate inhomogeneous signal intensity posterior to the knee joint which represents a thrombosed popliteal artery aneurysm.
Aneurysm, Fig.1 (a)
Aneurysm, Fig.1 (b)
Aneurysm, Fig.1 (c)