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Ultrasound B-scanning in the differentiation of Baker's cyst and thrombophlebitis.

Abstract Ultrasound B-scans of the knee joint and upper calf region were performed in transverse and sagittal planes. Baker's cysts and peripheral oedema each produce a characteristic echographic pattern which can be distinguished from the normal pattern. Ultrasound thus affords a simple, rapid, non-invasive technique for distinguishing between thrombophlebitis and irritation or rupture of a Baker's cyst.