PMC3676989_01
CT petrous bones axial image showing left middle ear soft-tissue mass.
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fig1
He also subsequently had a CT of his petrous temporal bones, as represented in Figure 1, which showed a 1.7 x 1.4 cm expansile soft-tissue mass within the lateral aspect of left middle ear and superior mastoid, prolapsing into external ear canal and associated with destruction of tegmen tympani, scutum, and the roof of the external ear canal; the mass was also seen to abut onto the ossicles but did not cause any ossicular erosion.
CD1a immunohistochemical stain highlighting the Langerhans cells (x20).
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fig2
Langerhans' cells. Langerhans' cells are also labelled with S100 and CD1a (Figure 2).