PMC3235990_01
Chest roentgenogram (postero-anterior) view shows a thick-walled cavity with a wavy meniscus involving the lingula.
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The chest radiograph (Fig. 1) showed a large thick-walled cavity involving the lingular lobe, containing an irregular wavy fluid level, suggestive of floating particulate matter ("waterlily sign").
Surgical specimen containing dissected hydatid cyst shows a convoluted mass of glistening white endocyst within the ectocyst cavity. Wavy outline of the detached endocyst and the crescentic space above correspond to the wavy meniscus on the chest roentgenogram.
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Gross examination of the surgical specimen (Fig. 2) revealed the cavity to be a hydatid cyst that was 7.5 cm in its largest diameter.
High power micrograph of the cyst-fluid showing several hook-lets of the Echinococcus.
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Microscopic examination of the fluid sediment (Fig. 3) disclosed several hooklets and other remnants of scolices diagnostic of cystic echinococcosis.
High power micrograph of the cyst wall (hematoxylin-eosin stain) showing infiltration with inflammatory cells and scores of branching hyphae that resemble Aspergillus species.
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