INTRODUCTION: Echinococcus is a parasitic disease that affects all organs and tissues. The most commonly affected are liver (70-80%) and lungs (10-25%), while very rarely, in about 5% of cases, it can be found in the spleen, kidneys, brain, heart, pancreas, muscles and skeleton. CASE REPORT: Although localization of hydatid cyst in muscle is rare, it is important to consideredPORT it in the differential diagnosis of a cystic mass in the muscle. Clinical diagnosis of cystic echinococcosis is based on general ultrasound imaging, CT, MRI, differentiation of Echinococcus-Ag, ELISA testing, immunoelectrophoresis (IEP), counterimmunoelectrophoresis (CIE). DISCUSSION: Surgery is the primary treatment for muscle hydatidosis. We present our experience in treating the case of an infected hydatid cyst on transverse abdominal muscle, with infection extending to the right diaphragm and subcutaneous tissue of abdomen and thorax between the transverse abdominal and internal sternal abdominal muscles. CONCLUSION: The goal of the surgical treatment is total evacuation of the parasite, “sterilization“ of the residual cavity and handling of intraoperartive complications. The post-operative course was normal and the patient was discharged to home care ten days after surgery in good general and local condition.