An unusual cause of mass in the shoulder: A primary hydatid cyst

Area of Science:

• Medicine
• Parasitology
• Infectious Diseases

Background:

• Hydatid cysts are zoonotic parasitic infections caused by Echinococcus tapeworms.
• They commonly affect the liver and lungs, but can occur in any organ.
• Primary muscular hydatid cysts are exceptionally rare, accounting for <0.7-3% of cases.

Observation:

• This case report details an unusual instance of a primary hydatid cyst.
• The cyst was located in the left deltoid muscle, a rare site for this infection.
• The patient presented with a cystic lesion in the muscle.

Findings:

• The diagnosis of a hydatid cyst was confirmed.
• The unusual localization in the deltoid muscle highlights the diverse presentation of the disease.
• The case underscores the importance of considering hydatid disease in cystic lesions.

Implications:

• Accurate diagnosis and prompt management are essential to prevent complications.
• Awareness of rare presentations like muscular hydatid cysts is vital for clinicians.
• This case contributes to the understanding of Echinococcus infection epidemiology and clinical manifestations.