case_images: PMC8042541_01
case_images: A preoperative chest computed tomography scan shows about 4-cm-sized mass
  with internal low attenuation and peripheral enhancement in right upper lobe
  apical segment (A, arrow). A positron emission tomography-computed
  tomography scan shows a well-defined lesion with intense fluorodeoxyglucose
  uptake in right upper lobe (B, arrow).
case_images: 10.1177_23247096211008593-fig1.jpg
case_images: PMC8042541_01_10.1177_23247096211008593-fig1.jpg
case_images: fig1-23247096211008593
case_images: A positron emission tomography-computed tomography scan showed a well-defined mass-like lesion with intense fluorodeoxyglucose uptake in medial portion of RUL (Figure 1).
case_images: Gross photograph of the wedge resection specimen shows an ill-demarcated
  yellow-tan solid mass with hemorrhage and necrosis (A). Microscopically, the
  ill-defined tumor is bordered by thick inflamed tissue containing lymphoid
  follicles (B, red: tumor, blue: lymphoid follicles, yellow: lung
  parenchyma). The pleomorphic tumor cells show numerous neutrophils
  infiltrate. Note the frequent mitotic figures (C, yellow arrows). Tumor cell
  necrosis is seen, which is a feature of high-grade sarcoma (D).
  Immunostaining for vimentin reveals diffuse strong cytoplasmic staining (E).
  Immunohistochemistry for pancytokeratin is negative in tumor cells, while
  remaining pneumocytes and bronchiolar epithelium show normal expression
  (F).
case_images: 10.1177_23247096211008593-fig2.jpg
case_images: PMC8042541_01_10.1177_23247096211008593-fig2.jpg
case_images: fig2-23247096211008593
case_images: Cut section of the wedge resection specimen showed an ill-demarcated yellow-tan solid mass with hemorrhage and necrosis (Figure 2A). Microscopically, the ill-defined tumor was bordered by thick inflamed tissue containing lymphoid follicles (Figure 2B). Frequent mitotic figures were identified (Figure 2C). Several foci of tumor cell necrosis were also seen (Figure 2D). TTF-1, p63, LCA, CD34, CD30, S-100, SMA, and desmin (Figure 2E and F).