"Differential diagnosis "
"See also "
"The radiological appearance of lobar pneumonia is not specific to any single causative organism, although there are organisms which classically have a radiological presentation of lobar pneumonia. Streptococcus pneumoniae (also known as pneumococcus) is the most common causative organism of lobar pneumonia."
"The most common cause of lobar pneumonia is Streptococcus pneumoniae. Other causative organisms that may cause a lobar pattern include 1:"
"Klebsiella pneumoniae"
"Legionella pneumophila"
"Haemophilus influenzae"
"Mycobacterium tuberculosis"
"Klebsiella pneumoniae"
"Legionella pneumophila"
"Haemophilus influenzae"
"Mycobacterium tuberculosis"
"On contrast-enhanced CT, pneumonia often enhances less than atelectatic lung, although there is no clear CT density threshold to distinguish the two. For example, one small study used a threshold of 85 HU to distinguish between atelectasis versus pneumonia on CT PA protocol with a sensitivity of 90% and specificity of 92% 10. However, there is overlap, and also factors such as pulmonary haemorrhage and underlying malignancy likely affect the lung density."
Expected headings
"Complications"
"Differential diagnosis "
"See also "
"The presentation of lobar pneumonia depends on the severity of the disease, host factors and the presence of complications. Lobar pneumonia may present with a productive cough, dyspnoea, pyrexia/fevers, rigors, malaise, pleuritic pain, and occasionally haemoptysis."
"Consolidation in lobar pneumonia mainly affects the alveolar air spaces. There is characteristic relative sparing of the bronchi, creating the appearance of air bronchograms. The distribution of consolidation is lobar because of the spread of infection across segmental boundaries - facilitated by the pores of Kohn and the canals of Lambert 3 - although limited by pleural boundaries."
"Characteristically, there is homogeneous opacification in a lobar pattern. The opacification can be sharply defined at the fissures, although more commonly there is segmental consolidation 3. The non-opacified bronchus within a consolidated lobe will result in the appearance of air bronchograms. Strictly speaking, consolidation is not associated with volume loss; however, atelectasis can occur with small airway obstruction."