Pulmonary paragonimiasis is a food-borne parasitic disease caused by the lung fluke (trematode) Paragonimus westermani. It is endemic in southeast asia, the the far east, and is also relatively common latin america and Africa 1-2. The disease affect can both the lung and pleura 3 although lung parechymal involvement is thought to be commoner than plerual involvement 2.
CT chest: HRCT
It usually manifests as a poorly marginated subpleural or subfissural nodule of about 2 cm in diameter that frequently contains a necrotic low-attenuation area 2. The constellation of focal pleural thickening and subpleural linear opacities leading to a necrotic peripheral pulmonary nodule is another frequent CT finding.
There also a myriad of other associated non specific features. These can vary with the stage of disease.
Early findings are thought to be caused by the migration of juvenile worms and include:
Later findings are thought to caused by worm cysts and include:
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