Interstitial disease can manifest as reticular (fine network of linear opacities), nodular (small opaque nodules 1-5 mm in size), or a combination of the two, reticulonodular.
Lobar pneumonia results when the inhaled organism reaches the distal alveoli beneath the visceral pleural surface.
, this is best appreciated with CT scan, which shows diffuse increased density of the lungs (a hazy appearance called “ground glass opacification”) as well as thickening of the septae (causing a prominent mesh-like pattern).
Furthermore, one study utilizing trans-thoracic needle biopsy suggested that pneumococcus might account for the majority of cases where a pathogen is not revealed by standard tests (Ruiz-Gonzalez 1999).
Most pneumonia actually affects both compartments, but one or the other is predominant.
(Similar to the concept of osteoblastic and osteolytic metastasis: some elements of both are usually present, though one is more established.) The classic pattern of involvement in the common pneumonias is airspace disease causing consolidation and air bronchograms.
Pneumonia is an infection of the alveoli or the walls of the alveolar sacs.
Diagnosis of pneumonia is relatively straightforward; however, since so many microorganisms can cause pneumonia, determining the cause of a patient’s pneumonia can be very difficult.
The distinction from pneumonia is on the basis of non-radiological investigations. The classic Kerley lines are made by the thickening of the interlobular septa that carry the lymphatics (Kerley B lines are short thin lines, 1.5 to 2cm in length, seen in the periphery of the lower lung, extending to the pleura).Diagnostic Difficulties in Community-Acquired Pneumonia (CAP). It is important to determine whether the cause of CAP is a bacterium, atypical bacterium, or virus, because they require different treatments. pneumonia is the most common cause of pneumonia, but respiratory syncytial virus may also cause the disease.Although symptoms may differ, they often overlap, which can make it difficult to identify the organism by symptoms alone.In severe cases, a doctor needs to use invasive diagnostic measures to identify the cause of the infection.Standard lab tests used to help diagnose pneumonia include: Sputum Tests. describe how one determines a person has pneumonia. Reading: Lower respiratory tract infections cause disease in the alveolar sacs, and the resulting infections are called pneumonia.