Demonstration of rhomboid protogranules by electron microscopy is diagnostic.电镜下可见瘤细胞胞浆有明显的球旁细胞的菱形颗粒。
During the Song and Yuan Dynasties the bronze mirrors appeared in all shapes: round, rectangular, rhomboidal, octagonal,宋、元时期出现了圆镜、长方镜、棱镜、八棱镜和带柄手镜等。