TB is usually confirmed by two things either bacteriological confirmation i.e microscopy, culture to directly visualise the bacteria.....2nd one is histopathological confirmation where tb granuloma
is seen in tissue specimen...FNAC is an example of second one. it is a reliable test.
In endemic country like india you can contract TB at any time and if cofirmed again you will have to take the treatment.
node is the second most common site for tb after lungs so it is not necessary to have concomitant lung tb..