So what's the differential diagnosis of somebody
with suspected lung cancer. Well firstly if
you have a mass on the x-ray, it could be
a lung cancer. But also it could be a metastases
or other types of cancers which I am going
to describe in little more detail later in
this talk. It could be one of the rarer, more
benign tumours such as carcinoids. But those
are very rare already in practice and you
would see many cases on cancer for each carcinoids
you have not seen.
More importantly somebody that's presenting with
lung abnormalities on x-ray and systemic symptoms.
It could be a lung infection tuberculosis,
lung abscess, some of the less common parasitic
and fungal infections are potentially possible.
It could be a benign mass, it may not be
a lung cancer at all. So when somebody has
got the symptoms and a lung mass who is a smoker
it might be a lung cancer. But it could also
be cause of other problems which are not really of any
major concern such as enfolded lung as well.
You get a pleural effusion which has involved
a part of the underlying lung and that
look's like peripheral lung mass on a chest
x-ray and there's various other things of lung
sequestrations, Parenchymal scar from previous infection
that might be thought to be a lung cancer initially
then turnout not to be on further investigation.
And then there is a few inflammatory conditions
that affect the lungs and occasionally it could
be mistaken. Because they cause lung abnormalities
on x-ray and systemic symptoms which may be
thought to be of cancers such as sarcoids and
vasculitis. But they are pretty unlikely to
be confused most of the time.