Thanks for your query,
Your x-ray shows focal opacity.There were various reasons of this opacity.The first one they put as an nodule.the other possibility may be a pneumonitis
or fungal infection
patch ,or calcified spots or may be an mycobactarium infection.
your CT scan
will help to locate its exact place with measurement & biopsy
will decide its benign or malignant nature.
So don't worry wait for CT report to come.Thanks