{'fraction_non_alphanumeric': 0.026101141924959218, 'fraction_numerical': 0.009787928221859706, 'mean_word_length': 4.847619047619047, '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}}
Aortic dissection complicated by a mediastinal haematoma and haemoptysis.

The patient 
A 76 year old hypertensive woman presented with massive haemoptysis and right-sided pleuritic chest 
pain. 
Investigations 
A chest radiograph and computed tomography (CT) were performed. 
Comment 
In the majority of cases of thoracic aortic dissection, the predominant presenting symptom is chest pain, 
occurring in over 90% ofcases. Haemoptysis is a rare but well-documented complication, occurring in 6% 
of cases.' It may rarely be the sole presenting feature2 and may occur in association with a mediastinal 
haematoma.