Inflammation of an appendiceal remnant, or stump, after appendicectomy is a little-known clinical presentation. Sonography can be useful in the diagnosis of stump appendicitis; by either directly visualising the inflamed stump, or by identifying secondary sonographic signs that can raise suspicion of the condition. It is important that sonographers are aware of this possible diagnosis in patients that have previously undergone appendicectomy. We describe two cases of children presenting with right lower quadrant pain post-appendicectomy.