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Figure 3 :(a) Section showing multiple lobules of elongated or plump spindle-shaped cells with slightly fibrillar cytoplasm arranged in interlacing fascicles or storiform configurations. (b-c) Immunohistochemistry studies showing strong, diffuse immunoreactivity for S-100, characteristic of a pituicytoma (b) and immunoreactivity for GFAP (c) but negative for EMA (d) (original magnifications, ×400)

Figure 3 :(a) Section showing multiple lobules of elongated or plump spindle-shaped cells with slightly fibrillar cytoplasm arranged in interlacing fascicles or storiform configurations. (b-c) Immunohistochemistry studies showing strong, diffuse immunoreactivity for S-100, characteristic of a pituicytoma (b) and immunoreactivity for GFAP (c) but negative for EMA (d) (original magnifications, ×400)