Lung mass. Diagnosis? • Xray of the Week Figure 1. What is the lung mass? Figure 2. Pulmonary hamartoma Figures 2A and 2B: Axial CT chest demonstrating well-demarcated, solitary peripheral, and inhomogeneous pulmonary mass arising from right lower lung lobe (yellow arrows). Note the low attenuation fat in the mass which is diagnostic of hamartoma. Small calcifications are also present. Figure 2C: Sagittal CT chest demonstrates posteriorly located well-demarcated solitary pe

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