Figure 3. Immunohistochemistry with the CD30 antibody of a pterygium. Representative microphotograph (100×) of a pterygium stained with CD30. The arrow indicates the strong immunoreactivity of CD30 predominantly in basal epithelium in comparison to the weak reactivity to CD30 in parabasal and superficial epithelium. The asterisk indicates perivascular immunostaining with strong immunoreactivity to CD30. The strong perivascular staining of CD30 is shown by arrowheads in the inset at higher magnification (400×).