Before radiotherapy the circular surface structure of the hair shafts in the patients were shown, the cells of the outermost layer were in imbricative and parallel arrangements.

• 放疗前毛干呈圆柱形,毛干毛小皮细胞鳞片状排列呈波浪样,并与毛干长轴大致垂直,与健康人头发比较未见明显差别。