Bilateral upper middle femur medullary cavity in the long strip slightly long is a manifestation of imaging, may be osteomyelitis, bone tumor lesions and other causes. 1. Osteomyelitis: usually caused by chronic osteomyelitis, chronic osteomyelitis can be due to trauma, local infection lesion invasion and hematogenous pathway metastasis, accompanied by sinus tract formation, etc., the local pain and discomfort is obvious, and the acute attack can appear chills and fever and other manifestations. 2. Bone tumor lesion: it can be seen in bone tumor lesion such as osteoid osteoma and myeloma, etc., usually with local pain, sometimes accompanied by local mass, which needs to be combined with puncture and other hematological examinations to make a clear diagnosis. The long stripes in the medullary cavity of bilateral upper middle femur are only a kind of imaging expression, it is not a characteristic change, many diseases can cause this phenomenon, need to consult a doctor, combined with medical history, physical examination, other imaging and hematological examination and puncture, etc. to jointly evaluate.