Thanks for your query.
I think as per your history if the shadow is in the lungs and if it is single then we call it Solitary Pulmonary Nodule
(SPN). There are many causes of SPN like infective like TB, Fungal inafection, neoplastic causes both benign like hamartoma and malignant like bronchogenic carcinoma
or this shadow may be rheumatoid nodule
or other CTD manifestations or may be a vascular shadow. Every possibility to be judged under your clinical context which you have not described here in much details. I will advise you to go for contrast enhanced CT scan (CECT) thorax for better deliniation of the shadow and CT guided fine needle aspiration cytology (FNAC) if possible to bring out the tissue diagnosis because it will be very helpful in the management purpose. Again CT guided FNAC if cannot be done then fibre-optic bronchoscopy
(FOB) can be done to bring tissue for diagnosis. If on CECT it seems to be a vascular shadow then CT-angiography is to be done for diagnosis. That should be the approach from a pulmonologist's view point. Therefore you should consult a pulmonologist
rather than a general physician for better opinion.