[Unusual fissural cysts and an odd mesiodens].

Two radiological "pitfalls" were detected fortuitously. In the first case there were two images suggestive of fissural cysts of the maxilla between the lateral incisors and the canines which were found to be zones of osteolysis of unknown origin. The radiological image in the second case, of a mesiodens situated high in the palate, was finally diagnosed as being due to a rhinolith.