Given an association with piloid
gliosis and abundance of Rosenthal fibers, even an old, often superficially located pilocytic astrocytoma with abundance of calcifications enters into the differential.
The first is a cytologically bland and generally paucicellular astroglial proliferation with spindle, stellate, and piloid
cells resembling pilocytic astrocytoma (Figure 12).
16] In these 5 cases, the astrocytic proliferation was composed of elongated piloid