title: Case report 398: Friction by pes anserinus.
mesh_terms: D000328:Adult; D006801:Humans; D007719:Knee Joint / Q000000981:diagnostic imaging / Q000473:pathology*; D008297:Male; D009132:Muscles / Q000473:pathology; D009999:Ossification, Heterotopic / Q000150:complications / Q000175:diagnosis*; D010146:Pain / Q000209:etiology; D010521:Periosteum / Q000473:pathology; D011859:Radiography; D011877:Radionuclide Imaging; D013710:Tendons / Q000473:pathology