MSK and sports case 2

Findings:

• Axial contrast enhanced CT shows a multilocular cyst with multiple internal non-enhancing daughter cysts in the right iliacus muscle.

Diagnosis:

Hydatid cyst of iliacus muscle

Discussion:

• Musculoskeletal hydatid cysts are a rare form of hydatid infection.
• Common locations for MSK hydatid include vertebrae and paravertebral muscles, pelvis and lower limbs. 
• If unilocular other cystic appearing lesions may be added to the differential such as intramuscular myxoma, chronic hematoma or nerve sheath tumor.