 So, coming to the lateral quadrant of the ankle, we are left with peroneal tendons. Before we begin with assessment of the peroneal tendons, let's revise our bony landmarks which is your lateral malleolus, the peroneal tubercle and the base of the fifth metatarsal. Now, this is a volume rendered image showing the peroneus brevis tendon and the peroneus longest tendon over here. So, in the retromalleolar segment, the peroneus brevis lies anteriorly to the peroneus longus and the peroneus brevis has a shorter course as it goes and attaches over the base of the fifth metatarsal whereas the peroneus longus as it goes into the inframalleolar segment, it goes inferior to the peroneal tubercle and it goes and enters the foot. The peroneal tendon sheath consists is a Y-shaped structure. So, in the supramalleolar segment, it has a single limb whereas as it goes down, it splits into two. So, it is typically an inverted Y-shaped kind of a structure. The peroneal tendons are stabilized by the superior and inferior peroneal retinaculite and these retinaculite prevent subluxation or dislocation of the tendons. This is another diagram just to show a better depiction and we see the peroneus brevis which is closer to the bone, that's the peroneus longus, this is the tendon sheath and these are the superior and inferior peroneal retinaculite. When we take a cross section, this is what the peroneal retinaculum looks like, that's the fibula. Located in the groove, we have the peroneus brevis which is close to the bone and the peroneus longus tendon, they are surrounded by the tendon sheath and this orange shaped outline structure is a peroneal retinaculum which goes and attaches over the fibula with the help of a fibrocartilaginous structure. So, this peroneal retinaculum allows lateral subluxation or dislocation of the peroneal tendons. The peroneal tendons are evaluated in the short axis so what we see over here is the fibula, that's the peroneus brevis tendon close to the bone, that's the peroneus longus and we still see the brevis muscle belly. As we go down further, we see the peroneus brevis, peroneus longus and this hypoechoic structure as it attaches over the lateral malleolus is the peroneal retinaculum. On the long axis, the peroneal tendons are not seen typically as any other tendons, fibrillary patterns set into bundles over here, that's the smooth cortex of the lateral malleolus. As we go to the inframalleolar segment, the peroneus longus is seen inferior to the peroneal tubercle whereas peroneus brevis is seen superior to it. In this case, the peroneal tubercle is slightly shallow hence really not that well seen but then this is an anatomical variant that we should all be prepared for. Some of the peroneal tubercles might be really prominent while some might be almost flat so we should know that. Of course, peroneal tendons also need to be evaluated on dynamic scanning, we see them while asking the patient to avoid the foot and in this case we see the peroneal retinaculum and we see some intra sheath subluxation of the peroneus brevis below the peroneus longus tendon. So with this, the take home message would be if you want to scan the ankle or any joint for that matter, knowledge of anatomy is a key. You should have a systematic approach and you will do a good job without getting lost anywhere. We should know about the anisotropy at various levels at the attachment of the Achilles tendon where the peroneal tendons curve around the lateral malleolus. Focus at the site of the symptoms. In musculoskeletal ultrasound most of the times the findings are going to be at the site of the pain and use dynamic imaging wherever necessary. So these are the last couple of images that I would want you to see. This is the orientation of the probe for the anterior inferior tibia fibula ligament, the anterior tarafibula ligament and that's the orientation for the calcane of fibula ligament and this is the take home slide that you need to know. Now all these structures have been mentioned in the ESSR guidelines. Hence you need to know how to evaluate them. Thank you.