case_images: PMC9583201_01
case_images: Cerebral MRI in coronal, sagittal and axial section showing a
  superolateral extraconal tissular mass extending through the superior
  orbital fissure and along the dura mater measuring 36.6 mm x
  32.7 mm.
case_images: 10.1177_20363613221135987-fig1.jpg
case_images: PMC9583201_01_10.1177_20363613221135987-fig1.jpg
case_images: fig1-20363613221135987
case_images: The cerebral computed tomography (CT) and magnetic resonance imaging (MRI) showed a superolateral extraconal tissular mass extending through the superior orbital fissure and along the dura mater, measuring 36.6 mm x 32.7 mm (Figure 1).
case_images: (a) Langerhans cell histiocytosis showing intermediate-sized cells with
  grooved, indented and lobed nuclei and pale eosinophilic cytoplasm
  surrounded by large numbers of eosinophils (HEx400). Langerhans cell
  histiocytosis with S100 (b) and CD1a (c) immunoreactivity on the
  majority of cells (IHCx400).
case_images: 10.1177_20363613221135987-fig2.jpg
case_images: PMC9583201_01_10.1177_20363613221135987-fig2.jpg
case_images: fig2-20363613221135987
case_images: On immunohistochemistry, Langerhans cells express S100 and CD1a (Figure 2).
case_images: Orbital MRI revealing no abnormalities 9 months after diagnosis.
case_images: 10.1177_20363613221135987-fig3.jpg
case_images: PMC9583201_01_10.1177_20363613221135987-fig3.jpg
case_images: fig3-20363613221135987
case_images: On account of this CT-MRI discordance, we performed an Orbital MRI which revealed no abnormalities compared with the first one (Figure 3).