Fig. 3
From: Pseudotumoural soft tissue lesions of the foot and ankle: a pictorial review
Synovial cyst. A 34-year-old female patient with lateral foot pain and soft tissue mass posterior to the lateral malleolus. Ultrasound examination in the paracoronal (a) and coronal plane (b) demonstrates a well-circumscribed, bilobular, mostly anechogenic lesion (asterisk) with posterior acoustic enhancement, correlating with a cystic nature. Some echogenic debris is present in the dependent part of the lesion. The lesion causes displacement of the sural nerve (arrowheads), causing lateral foot pain