White-light images, with the stars subtracted using a median filter, from the STEREO-A HI-1 instrument showing the April event on the 16 of April 07:29 UTC (left) and the May event on the 26 of May 15:29 UTC (right). The image of the April event shows a slightly flattened Earth-directed CME with a faint leading edge, an elliptical cavity, and a strong density pile up at the back. The image of the May event shows a structure at a higher latitude that is hard to identify in a single image (marked with the yellow arrow) and does not contain an obvious cavity.