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Background/Objective Hydatid disease of the aorta is very rare. Hydatid disease can result in saccular aneurysm of the thoracic and abdominal aorta. Case report We report a rare case of saccular aneurysm of the distal descending thoracic aorta. The diameter of the aneurysm was 60 mm. It was managed by Thoracic Endovascular Aneurysm Repair. After 41 months, computed tomography angiography revealed a multi-loculated cystic lesion with 86 × 83×80 mm dimensions in the prevertebral area at the T10-T11 level with bony destruction and erosion of the anterior margin of the vertebral bodies. A computed tomography-guided fine-needle aspiration of the paravertebral cystic lesion was performed. Microscopic study of the fine-needle aspiration specimen demonstrated Echinococcosis granulosus diagnostic of hydatid disease. Conclusion It is concluded that the case was a mycotic aneurysm of the thoracic aorta secondary to vertebral hydatid disease.

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