case_images: PMC4531652_01
case_images: The chest PA shows a round mass with central low density in the right lower lobe.
case_images: kjim-17-1-78-15f1.jpg
case_images: PMC4531652_01_kjim-17-1-78-15f1.jpg
case_images: f1-kjim-17-1-78-15
case_images: The chest radiograph obtained at the time of admission showed a round mass in the right lower lobe (Figure 1).
case_images: The chest CT shows a large cystic mass with central low density and no mediastinal or hilar lymphadenopathy.
case_images: kjim-17-1-78-15f2.jpg
case_images: PMC4531652_01_kjim-17-1-78-15f2.jpg
case_images: f2-kjim-17-1-78-15
case_images: The chest CT scan documented a slightly increased size of the mass, with more increased extent of the central low density compared with the previous chest CT and no mediastinal or hilar lymphadenopathy (Figure 2).
case_images: Microscopic views. The epithelial component shows poorly differentiated squamous cell carcinoma (A) and the mesenchymal component shows chondrosarcoma (B). (H & E stain, x 400)
case_images: kjim-17-1-78-15f3.jpg
case_images: PMC4531652_01_kjim-17-1-78-15f3.jpg
case_images: f3-kjim-17-1-78-15
case_images: The carcinomatous components consisted of poorly differentiated squamous cell carcinoma and the sarcomatous components were considered chondroid sarcoma in the light of microscopic findings (Figure 3).
case_images: Immunohistochemical stainings. The poorly differentiated squamous cell carcinoma shows focal positive for epithelial membrane antigen (A). The chondrosarcoma shows positive for vimentin (B). (x 400)
case_images: kjim-17-1-78-15f4.jpg
case_images: PMC4531652_01_kjim-17-1-78-15f4.jpg
case_images: f4-kjim-17-1-78-15
case_images: Light microscopic immunohistochemical analysis showed that the tumor cells in the carcinomatous component reacted with anti-epithelial membrane antigen (EMA) antibody and the tumor cells in the sarcomatous component reacted with anti-vimentin antibody (Figure 4).