Subcutaneous Hydatid Cyst of the Right Thigh in a Young Female: A Rare Case Presentation

Hydatid disease is a parasitic infection caused by Echinococcus granuloses, commonly affecting the liver and lungs. However, isolated subcutaneous hydatid cysts are rare and can pose a diagnostic challenge due to their atypical location and non-specific presentation. We report the case of a 22-year-old female from Ahmadpur, Pakistan, who presented with a painless, gradually enlarging swelling in the anterior aspect of her right thigh for the past 7 years. Physical examination revealed a soft, non-pulsatile, non-tender mass not adherent to the skin or underlying muscle. Ultrasonography suggested a multi-loculated cystic lesion in the subcutaneous plane, raising suspicion of a hydatid cyst. Serological testing for Echinococcus IgG was positive. The patient underwent surgical excision of the cyst under general anesthesia. Histopathological examination confirmed the diagnosis of a hydatid cyst with granulomatous inflammation and giant cell reaction. Postoperatively, she was managed with albendazole and discharged in stable condition. This case highlights a rare subcutaneous manifestation of hydatid disease in the thigh. It emphasizes the importance of considering parasitic infections in the differential diagnosis of long-standing soft tissue swellings, especially in endemic areas. Early surgical intervention combined with antiparasitic therapy is essential for complete resolution and recurrence prevention.