case_images: PMC11729004_01
case_images: (A) Chest -X- ray showing round opacity of irregular contours located in the right lung. (B) Computed tomography (CT) of the chest showing a mass with irregular margins located in the apical segment of the right lower lobe. (C) Moderate enhancement of the mass after administration of contrast medium.
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case_images: Chest x-ray revealed a right lung round opacity with irregular contours (Fig. 1A). Computed tomography showed a mass with spiculated margins and central necrosis, located in the apical segment of the right lower lobe (Fig. 1B), moderately contrast- enhanced, measuring 4 x 2.8 x 3.2 cm (Fig. 1C).
case_images: (A) Pulmonary cytology: sheet of atypical cells suggestive of small cell carcinoma (Hematoxylin and eosin staining; magnification x 400) (B) Histological examination showing laminated acellular hydatid membrane, PAS stain positive.
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case_images: Pathology examination of the bronchial aspiration revealed bronchial cells isolated or grouped in clusters and showing an anisokaryosis with voluminous ovoid or elongated nuclei with finely distributed non-nucleated chromatin, suggestive of malignant cells (Fig. 2A). The histological examination showed a hydatid cyst composed of a laminated membrane lined by a proligerous membrane made up of a layer of eosinophilic cells (Fig. 2B), confirming the diagnosis of pulmonary hydatid cyst.