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Hydatid Cyst

Imaging findings

Chest radiograph shows a large, smooth, and well-circumscribed mass-like consolidation in the left lower lobe. Chest CT demonstrates a large, homogeneous, fluid-filled cystic lung mass (-5 to 15 HU) with thin, smooth walls and no internal enhancement, located in the posterior segment of the left lower lobe, with a moderate pleural effusion.

Key takeaways

Pulmonary hydatid disease is a parasitic infection caused by the larval stage of the tapeworm Echinococcus granulosus, endemic in sheep-raising regions of the world (including Mexico). In the lungs, it presents as a large, fluid-filled cystic mass with smooth margins. Complications include rupture into the bronchial tree or pleural space, and management is surgical excision combined with albendazole.

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