A child of 5 years old with complains of periodic knee pain that appeared several days ago, which occurs when touching the front surface of the knee and while walking pain which does not limit mobility in the knee joint. Consulted by a surgeon and orthopedic surgeon, directed to an ultrasound scan with suspected inflammatory process of the corresponding knee. Upon visual inspection, both knees on the front surface, the patient is more likely to have thickened rough-skin as a skin corn. The child does not notice a pronounced pain when touching the zone of interest. At ultrasound scan visualised an asymmetry of skin thickness and subcutaneus fat: right(affected side) > left, marked heterogeneity of the skin/subcutaneus fat echo-structure on the right, increased blood flow by venous type at spectral doppler. PS. files 1-3 right knee, file 4 - left knee. external link | 
