So let's discuss interstitial pneumonia.
Interstitial pneumonia produces a fine reticular pattern
which is different than what we see with consolidation.
Often, this can spread to the alveoli over time and results in a more focal consolidation as well.
This may be seen as a viral or atypical pneumonia
such as mycoplasma or pneumocystis where the finding start off as an interstitial pneumonia
and then eventually become consolidation.
So let's take a good look at this case here.
So this is an example of an interstitial pneumonia,
you can see that there is no silhouette in here.
You can see the margins of the heart clearly on both sides
and you can see the margins of the diaphragm clearly on both sides as well.
So there is no focal consolidation, however, throughout both lungs
you can see this kind of hazy opacity and you can see fine interstitial markings
throughout both lungs so this is an example of an interstitial pneumonia.
What about this case?
How does this look different than the other areas of consolidation that we've seen so far?
So this is an example of a cavitary lesion
which is a mass-like area of consolidation that has a central lucency.
So it's different from the other consolidation
because you have a normal area of consolidation with fluffy margins.
However, right in the middle of it you have this lucency which represents the cavitation.
This can be very thick-walled, they can vary in size,
and usually they're caused by such things as an abscess, TB, or possibly a cavitary carcinoma.
Let's take a look in this case.
So what can you say about this patient?
Is this an adult or is this a child?
So we wanna take an overall look at the x-ray before we focus on the findings here.
So if you look here, these bones are not fully developed at the shoulders
so this is actually a child and then do you see an area of consolidation here?
Take a look at the right lung.
So here we have an area of round pneumonia.
This is really most often seen in children.
It's usually seen posteriorly within the lung
and most commonly it's within the right middle lobe.
So this can actually look like a mass and usually needs to be followed
to make sure that it goes away but when you see something like this in a child
you would definitely wanna think about round pneumonia,
possibly treat the child first and then do a follow-up to make sure that it resolves.
Organisms that can cause this include H. flu, Streptococcus and Pneumococcus.
So aspiration pneumonia is a type of pneumonia that occurs from aspiration
and patients that have difficulty swallowing.
Usually it occurs in the dependent portions of the lungs,
so as you can see on this axial CT of the chest you have areas of consolidation
which is what this would look like on a CT bilaterally.
More often it's seen on the right because the right mainstem bronchus
is a little bit straighter than the left is.
Here you see it on both sides.
So we've gone over various different examples of consolidation.
Again, these are typical patterns that you may see
as you take a look at more x-rays
and hopefully this will help you recognize these patterns when you see them in the future.