Intraosseous hydatid cyst

Abstract

Hydatidosis is a parasitic disease caused by Echinococcus granulosus or echinococcal tænia, preferentially localized in the lung (20 to 30%) and in the liver (60 to 70%). Intraosseous localization is extremely rare. She did not complain on any difficulties swallowing or breathing. She has a background of mild Asthma for which she uses inhalers but otherwise is generally well in herself. She is a non-smoker and is fully vaccinated. Imaging features takes a very important place for the diagnosis and therapeutic management such as ultrasound, CT and MRI. MRI shows a large, well-limited and multiloculated cystic mass in cotyloid cavity, with daughter vesicles in hypo-intensity T1-weighted, hyperintensity T2-weighted with low diffusion coefficient and no contrast enhancement after injection of gadolinium. This mass causes a breach of cortex and extension to the adjacent soft tissue.