RNs and ANs presented a higher risk of reported asthma than administrative staff. The highest risk was associated with tasks involving dilution of disinfection products by manual mixing, suggesting possible exposure to repeated peaks of concentrated products known to be strong respiratory irritants. Workplace interventions should be conducted to more clearly determine QAC exposure and improve disinfection procedures.

Abstractfections. In the post-antibiotic era this complication of neck infection is much less Background -Descending necrotising mediastinitis is caused by downward common. Estrera et al 2 reported the largest series since 1960 with 10 cases. We have sucspread of neck infection and has a high fatality rate of 31%. The seriousness of cessfully treated seven adult patients with descending necrotising mediastinitis and also this infection is caused by the absence of barriers in the contiguous fascial planes present a child in whom the infection developed and spread rapidly, leading to death. This paper of neck and mediastinum. Methods -The recent successful treatment reviews these cases and presents a meta-analysis of 24 case reports and 12 series of adult desof seven adult patients with descending necrotising mediastinitis emphasises the cending necrotising mediastinitis since 1970. importance of optimal early drainage of both neck and mediastinum and prolonged antibiotic therapy. The case is also pre-Methods sented of a child with descending ne-  1 crotising mediastinitis, demonstrating the A 35 year old male engineer with a past history rapidity with which the infection can de-of hepatitis B was admitted following transfer velop and lead to death. Twenty four case from the intensive care unit of a peripheral reports and 12 series of adult patients with hospital. Five days prior to admission he had descending necrotising mediastinitis pub-sought medical attention for odynophagia, lished since 1970 were reviewed with meta-hoarseness, and mild left otalgia for which he analysis. In each case of confirmed des-was given oral penicillin. Forty eight hours later cending necrotising mediastinitis the he was admitted to the intensive care unit There were bilateral pleural effusions and lower 19% when mediastinal drainage was added lobe consolidation. The pericardial space was

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Thoracic aortic aneurysms (TAAs) can be broadly divided into true aneurysms and false aneurysms (pseudoaneurysms). True aneurysms contain all three layers of the aortic wall (intima, media, and adventitia), whereas false aneurysms have fewer than three layers and are contained by the adventitia or periadventitial tissues. Multidetector computed tomographic (CT) angiography allows the comprehensive evaluation of TAAs in terms of morphologic features and extent, presence of thrombus, relationship to adjacent structures and branches, and signs of impending or acute rupture, and is routinely used in this setting. Knowledge of the causes, significance, imaging appearances, and potential complications of both common and uncommon aortic aneurysms, as well as of the normal postoperative appearance of the thoracic aorta, is essential for prompt and accurate diagnosis. Supplemental material available at http://radiographics.rsnajnls.org/cgi/content/full/29/2/537/DC1.

Early discharge after outpatient TTNB of the lung is associated with little morbidity and no mortality.