{'fraction_non_alphanumeric': 0.016971279373368148, 'fraction_numerical': 0.0, 'mean_word_length': 5.338842975206612, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
[Congenital vascular rings in children].

Two children with symptoms of dysphagia, dyspnoea and chronic pulmonary infections secondary to anomalies of the aortic arch are presented. Diagnostic procedures included oesophagography and aortic arch angiography. These showed a double aortic arch in the first child and an aberrant right subclavian artery in the second one, leading to compression of both trachea and oesophagus. Both children underwent surgery: in the first child the atretic anterior arch and the left ligamentum arteriosum were divided; in the second child the aberrant right subclavian artery was divided at its origin from the descending aorta and connected to the ascending aorta. Follow-up examinations showed a complete recovery of both patients.