Intramuscular hydatid cyst in the lower extremity: report of three cases

Two hydatid cysts in the psoas muscle of a 40-year-old female: A rare case report

“…The definitive host of this tenia is dog, whereas the development in human is accidental by consumption of parasitized viscera, particularly the liver and lungs of the intermediate host (sheep) [ 6 ]. Echinococcus granulosus is the most common causative agent, while Echinococcus alveolaris is rare [ 7 ] It is endemic and constitutes a real public health problem in regions such as the Mediterranean, Middle East, South America, New Zealand, and Australia, predominantly affecting rural and poor populations [ 3 , 4 , 6 ]. While primary cysts can occur anywhere in the body, they are most frequently found in the liver (55–70 %) and lungs (20–30 %), with muscular tissue involvement accounting for only 2–3 % of cases [ 4 ].…”

Don’t miss it: Extremity-located cyst hydatid may mimic soft tissue tumors

“…[ 12 ] The USG was the first-choice imaging modality in our study, as it is non-invasive, inexpensive, and reproducible. [ 13 ] The presence of daughter cysts, separating membrane, and double-line sign on USG is pathognomonic. The MRI is still the gold standard in musculoskeletal hydatid cysts; multiloculated polycystic lesions and the appearance of collagenized and vascularized double-layered pericyst support the diagnosis (Figure 2).…”

“…The MRI is still the gold standard in musculoskeletal hydatid cysts; multiloculated polycystic lesions and the appearance of collagenized and vascularized double-layered pericyst support the diagnosis (Figure 2). [ 13 , 14 ] On T2-weighted MRI, the pericyst is seen as a hypointense ring and was smaller in size than a simple cyst. [ 12 ] With T2-weighted hypointense pericyst, daughter cyst or brood capsule hypointense or isointense may appear on T1- and T2-weighted sections.…”

“…The imaging of the hydatid cyst on CT is variable and rarely shows typical characteristics. [ 13 ] Both CT and MRI were chosen in this study for the number, size, anatomic location, local complications, and systemic involvement. In addition, MRI and CT play an essential role in diagnosing complicated hydatid cysts, such as rupture and superinfection.…”