Abstract: When a focused electron beam of 200keV energy with the characteristics used to obtain convergent beam diffraction patterns (CBED) in a transmission electron microscope (TEM) impinges on silver decahedral nanoparticles, a hole gets drilled in the site of incidence. The hole is the result of mechanisms of interaction which occur during the collision between the incident electrons and the target atoms, such as ballistic type, knock-on, temperature, etc. After the formation of the hole, and during observation time of the particle in the high resolution (HRTEM) mode, the hole is closed. The closing of the hole is an isostructural particle reconstruction, probably the result of the surface material diffusion together with the roughness at the atomic level of the hole's walls. [Copyright &y& Elsevier]