Lobar pneumonia

Lobar pneumonia
Figure A shows the location of the lungs and airways in the body. This figure also shows pneumonia affecting the lower lobe of the left lung. Figure B shows normal alveoli. Figure C shows infected alveoli.
Classification and external resources
Specialty	pulmonology
ICD-10	J18.1
ICD-9-CM	481
MeSH	D011018
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Lobar pneumonia is a form of pneumonia that affects a large and continuous area of the lobe of a lung.

It is one of the two anatomic classifications of pneumonia (the other being bronchopneumonia).

Lobar pneumonia usually has an acute progression. Classically, the disease has four stages:

The most common organisms which cause lobar pneumonia are , also called pneumococcus, Haemophilus influenzae and Moraxella catarrhalis. Mycobacterium tuberculosis, the tubercle bacillus, may also cause lobar pneumonia if pulmonary tuberculosis is not treated promptly.

Like other types of pneumonia, lobar pneumonia can present as community acquired, in immune suppressed patients or as nosocomial infection. However, most causative organisms are of the community acquired type. Pathological specimens to be obtained for investigations include:

The identification of the infectious organism (or other cause) is an important part of modern treatment of pneumonia. The anatomical patterns of distribution can be associated with certain organisms, and can help in selection of an antibiotic while waiting for the pathogen to be cultured.

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