Sixteen congenital small nevi (CSN) were studied by electron microscope, 18 caces malignant melanomas (MM), 3 congenital giant nevi (CGN) and 10 acquired nevi (AN) were taken as the controls.

• 在透射电镜下观察16例先天性小痣(CSN),并以18例恶性黑素瘤(MM)、3例先天性巨痣(CGN)及10例后天性痣(AN)作对照,以探讨CSN的超微结构特点及在MM发病中的地位。