PMC2797374_01
Axial (a) and sagittal (b) CT images demonstrate a lesion in the upper lobe of the left lung invading pleura and adjacent ribs (arrows).
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fig1
Invasion to the pleura and ipsilateral 6th, 7th, and 8th were also observed (Figures 1(a) and 1(b)).
Axial-fused PET/CT image shows a pleural-based tumor with a calculated SUVmax of 4.36 (arrow).
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fig2
Maximum calculated standardized uptake value (SUVmax) of the lesion was 4.36 (Figure 2).
Small-sized round cells with scanty cytoplasm were seen in light microscopic evaluation (x40).
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fig3
Light microscopy showed small size round cells with scanty cytoplasm assembling in alveolar structures (Figure 3).
Immunohistochemistry revealed positivity with (a) CD 99, (b) vimentine, and (c) synaptophysin (x400).
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fig4
After immunohistochemical analysis which showed positivity for CD 99, vimentine and synaptophysin (Figures 4(a), 4(b), and 4(c)), diagnosis of PNET was made.