PMC5797600_01
Chest CT. Transverse/coronal/sagittal planes demonstrate a round homogenous mass 32 mm x 27 mm in size in the superior segment of right lower lobe.
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F1
Chest CT showed a small, well-defined, round, and solid lesion (32 mm x 27 mm), in the superior segment of right lower lobe (Figure 1).
Positron-emission tomography (PET) demonstrates a diffuse, low FDG uptake (SUVmax 2.1) of the lesion, which exceeded that of vascular structure of the mediastinum (SUVmax 1.7).
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F2
Positron-emission tomography (PET) demonstrated a diffuse, low FDG uptake (SUVmax 2.1) of the lesion, which exceeded that of vascular structure of the mediastinum (SUVmax 1.7) (Figure 2).
(A) H-E stain revealed an area of encapsulated neoplasm surrounded by lung tissue. (B) Microscopic examination revealed proliferation of elongated tumor cells having spindle-shaped nuclei, with cellular palisading. No necrosis or nuclear atypia was observed. Immunohistochemical staining demonstrated positive staining of the tumor cells for S-100 protein.
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F3
Immunohistochemical staining was positive for S-100 protein and EMA(-), PANK(-), CD68(-), SMA(-), Desmine(-), CD31(-) (Figure 3).