en Clinical Medicine Clinical Medicine گزارش موردی Case Report Article <p style="text-align: justify;"><span style="font-size:16px;"><span style="font-family:Times New Roman;"><span style="line-height:150%"><span style="line-height:150%">Hydatid cysts can be caused by Echinococcus species in various tissues. Skeletal cystic lesions are very rare and may be neglected. Here, we report a case of pathologic fracture following primary hydatid cystic lesions in the proximal and femoral shaft bone. A 62-year-old man suffered a sudden fracture followed by swelling of the thigh. Intramedullary femoral fixation was made and during the surgery, numerous cystic lesions of the hydatid cysts were observed. After &nbsp;the surgery ultrasound and CT-Scans of the abdomen, lung, spine, and brain did not confirm any sign of mass or cyst elsewhere. The patient was followed up for one year. During this period, the union was not yet completely established and the patient was stillreceiving treatment. Orthopedic surgeons need to be aware of this parasitic complication in bones and joints and provide the best outcome for the patients with proper treatment. Surgery along with albendazole and/or mebendazole &nbsp;therapy remains the treatment of choice. For this purpose, it is recommended that attention be paid to long-term follow-up in continuous professional development courses.</span></span></span></span><br> <span style="font-size:11pt"><span style="background:white"><span style="line-height:107%"><span style="font-family:Calibri,sans-serif"><b><span style="font-size:16.0pt"><span style="line-height:107%"><span style="font-family:"Times New Roman",serif"></span></span></span></b></span></span></span></span></p> Hydatid cyst, Femoral bone, Fracture, Pathological fracture, Clinical education 374 378 http://journal.zums.ac.ir/browse.php?a_code=A-10-4750-3&slc_lang=en&sid=1 Ramin Farzam . raminfarzam2007@yahoo.com 5200319475328460073580 5200319475328460073580 No Dept. of Orthopedics, Faculty of Medicine, Zanjan University of Medical Sciences, Zanjan, Iran Mohammad Abdi Mohammad2016@zums.ac.ir 5200319475328460073581 5200319475328460073581 No Dept. of Critical Care Nursing, School of Nursing and Midwifery, Zanjan University of Medical Sciences, Zanjan, Iran Maryam Farhangi Mrsfarhangi2018@gmail.com 5200319475328460073582 5200319475328460073582 No Mahak s’ Pediatric Cancer Treatment and Research Center, Mahak Hospital, Tehran, Iran Mohammad Zibaei zibaeim@sums.ac.ir 5200319475328460073583 5200319475328460073583 No Dept. of Parasitology, School of Medicine, Alborz University of Medical Sciences, Karaj, Iran Hojjat Torkmandi Hojjat.or@gmail.com 5200319475328460073584 5200319475328460073584 Yes Dept. of Operating Room, School of Nursing and Midwifery, Zanjan University of Medical Sciences, Zanjan, Iran