Unusual location of hydatid cyst: thoracic outlet

Hydatid cyst is an infectious disease caused by cestodes. The organs most frequently involved are the liver and lung (70% and 25%, respectively). The other organs are affected by less than 10%. The spleen, kidneys, bile ducts, mesentery, heart, brain, vertebral column, ovaries, pancreas, gallbladder, thyroid gland, breast and muscloskeletal system or soft tissue are less frequently involved. In this article, we report a 49-year-old female patient with a histopathologically proven hydatid cyst which was located in the right thoracic outlet region. To our knowledge, a primary hydatid cyst of the thoracic outlet without invasion to the adjacent structures has not been previously reported.