Presentation
Complaining of pain on the lateral side of the left knee for the last few months. Significantly increased pain for the last 2 weeks. No history of trauma.
Patient Data
There is no fracture or dislocation on the available AP view. There is well-defined soft tissue calcification on the lateral side of the knee. The calcification shows variable density. High density is present in the caudal part and lower density is present in the upper part of the calcification.
There is an ovoid calcification (about 30 x 15 x 9 mm) involving the cranial half of lateral collateral ligament. It shows a central anechoic area. The lateral collateral ligament is intact. The caudal half of the ligament shows a normal echopattern. There is no overlying subcutaneous plane inflammation. There is no local hypervascularity.
Case Discussion
The case shows lateral collateral ligament calcification which is an uncommon cause of lateral knee pain.