A 16 years-old girl, a lover of extreme sports, complaining of pain in his left knee after a fall over the obstacle and the lesion of the upper third of the shin, which was seen about 1 year ago. She was in the emergency traumatology department, where she was executed Rg in direct projection, by the words of accompanying person, with no signs of structural changes. Visually, the front surfaces of the knees with the numerous small scars. At US in the area of the lateral meniscuses, bigger in the left side, there is an anechoic rounded single lesions (cysts, meniscal tear?). On anterior-medial surface of the upper third of the left shin visualized bulge of the bone' s border up to 1 cm in diameter, without blood flow at CFM (bone callus, exostosis?). external link | 
