Incidental Diagnosis of an Asymptomatic Hydatid Cyst Through Low-Grade 18F-FDG Uptake in the Peripheral Rim

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FIGURE 1.
Chest radiograph showing homogeneous round opacity (arrow) in right lower lobe.
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FIGURE 2.
Supine (left) and prone (right) CT scans showing cavity with mobile soft tissue within it.
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FIGURE 3.
(A) PET scan showing peripheral low-grade ¹⁸F-FDG uptake (arrow) with central area of photopenia (doughnut sign). (B) PET/CT scan showing central cavitary lesion (arrow) on CT portion of image. (C) CT scan showing peripheral ¹⁸F-FDG uptake (arrow) and central cavitary hypodense area.
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FIGURE 4.
Transaxial fused PET/CT scan showing peripheral ¹⁸F-FDG uptake (arrow) and central hypodense area with cavitation. Lesion appears to be communicating with bronchus.