A Case of <i>Paragonimus Westermani</i> Infection with Lung Cavitary Nodules

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  • 肺空洞性結節を呈したウェステルマン肺吸虫症の1例
  • ハイ クウドウセイ ケッセツ オ テイシタ ウェステルマン ハイキュウチュウショウ ノ 1レイ

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<p>A 46-year-old man presented to our hospital with bloody sputum that had persisted for two months. Bloody sputum gradually increased, and hemoptysis was present. A chest CT scan showed a nodular shadow with a cavity in the upper lobe of the left lung and swelling of the hilar lymph nodes. The possibility of lung cancer could not be ruled out, so an operation was performed. Yellow-brown cloudy pleural effusion was present in the thoracic cavity, and hypervascularity, white calluses, and reddish-brown spots were diffusely observed in the parietal pleura.</p><p>White pleural thickening and numerous nodules were noted on the diaphragmatic surface. Histopathological findings showed eggshell-like structure at the margin of the necrotic tissue within the tumor, and a parasite egg with several nuclei and an acidophilic cytoplasm inside. Westermann paragonimiasis was most suspected by antiparasitic antibody screening test. Combined with histopathological examination and antiparasitic antibody screening test, the case was diagnosed as Paragonimus westermani infection. Although Paragonimus westermani infection is relatively rare, it should be considered as a disease that should be differentiated from pulmonary masses.</p>

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