[False appearances of aortic arch in laryngomalacia (author's transl)]. / Faux aspects d'arc aortique au cours de la laryngomalacie.

The authors report six cases of congenital laryngeal stridor in which appearances of oesophageal compression had led to a diagnosis of abnormalities of the aortic arches. Two children underwent surgery, thoracotomy failing to reveal any abnormality. The other four were investigated by endoscopy which made it possible to eliminate the diagnosis of tracheal compression. All of these children were suffering from laryngomalacia. These cases indicate the need for complete routine studies, in particular endoscopic, in all cases of stridor, as well as for careful definition of the radiological criteria of abnormality of the aortic arches. The pathogenesis of these false appearances of oesophageal compression in laryngomalacia is discussed.

Renal abscess in children. A rare but important radiological diagnosis.

As in adults, renal abscess in children mimicks a tumoral syndrome. Renal abscess, although infrequent, should however be kept in mind because it is important to make an early diagnosis. The reason is simply that the treatment fo the two conditions is so different. Furthermore, an early accurate diagnosis avoids unnecessary investigations, such as arteriography, as well as unnecessary surgery. Four cases are reported in which the diagnosis of abscess was obtained by correlating both clinical and radiological findings. In only one case was arteriography performed and this was after treatment and it was normal. For an early diagnosis intravenous urography is of paramount importance. It shows a tumoral radiological pattern; in the context of clinical signs of suppuration (high fever, high leucocyte count and variably a urinary tract infection). The radiological findings suggest the diagnosis of abscess. On treatment the rapid regression and disappearance of the various clinical, laboratory, and radiological findings confirms the diagnosis of renal abscess.