case_images: PMC6385839_01
case_images: Posterior-Anterior (PA) chest X-ray. There is an ill-defined opacity in
  the right lower lung zone, with some degree of fine reticulation,
  extending to the lung periphery (Kerley B lines).
case_images: rbccv-34-01-0085-g01.jpg
case_images: PMC6385839_01_rbccv-34-01-0085-g01.jpg
case_images: f1
case_images: Chest X-ray showed a right lower lobe opacity (Figure 1).
case_images: A: Axial contrast-enhanced lung CT (mediastinal windows): There is a soft
  tissue attenuation mass at the level of the right lower pulmonary veins.
  The lesion abuts the posterolateral part of the right atrium. The mass
  exhibits coarse calcifications in its posterior part. Note the presence
  of a calcified bronchopulmonary node on the right, which could be
  attributed to a previous granulomatous infection. B: High resolution CT
  scan (lung windows) at the level of the lung bases, depicting thickened
  interlobular septa, patchy ground glass opacities and infiltrates,
  consistent with regional lung congestion due to impaired pulmonary
  venous return.
case_images: rbccv-34-01-0085-g02.jpg
case_images: PMC6385839_01_rbccv-34-01-0085-g02.jpg
case_images: f2
case_images: A chest computed tomography (CT) scan (Figure 2) revealed a solid mass, measuring 7 mm in diameter, in the lower part of the posterior mediastinum, extending 6.3 cm downwards from the level of the carina.
case_images: A: Axial T1-weighted image. The mass is almost isointense to the thoracic
  muscles (white asterisk). B: Coronal gradient-echo T2 image. The mass
  extends upward to the subcarinal region. The lesion exhibits a
  heterogeneous hypointensity (white asterisk), consistent with the
  presence of fibrous component. C: Axial T1-weighted image,
  post-gadolinium image. The mass (black asterisk) shows contrast uptake,
  more homogeneous in its anterior part. Note that the uptake is less
  homogeneous in its posterior part. Contrast uptake may represent areas
  with active inflammation.
case_images: rbccv-34-01-0085-g03.jpg
case_images: PMC6385839_01_rbccv-34-01-0085-g03.jpg
case_images: f3
case_images: Subsequently a chest magnetic resonance imaging (MRI; Figure 3), confirmed the presence of the space occupying lesion, extending to the subcarinal region.
case_images: Haphazardly arranged collagen lamellae separated by an inflammatory
  infiltrate.
case_images: rbccv-34-01-0085-g04.jpg
case_images: PMC6385839_01_rbccv-34-01-0085-g04.jpg
case_images: f4
case_images: The pathologic examination revealed dense bands of collagen separated by a chronic inflammatory cell infiltrate of lymphocytes and plasma cells (Figure 4).
case_images: Post-treatment, follow-up, axial T1-weighted, post gadolinium image. The
  mass has smaller dimensions and the contrast uptake is less intense
case_images: rbccv-34-01-0085-g05.jpg
case_images: PMC6385839_01_rbccv-34-01-0085-g05.jpg
case_images: f5
case_images: A new MRI scan was repeated nine months after the previous one, which showed that the dimension of the lesion remained unchanged (Figure 5).