A 54-year-old man with ch...

A 54-year-old man with a prior history of oral cancer and previous surgical treatment involving flap and bone graft presented to the OPD. He complained of chest pain located in the left mammary area persisting for the 1 month, accompanied by gradually worsening shortness of breath rated at grade 3 on the mMRC scale over the past 15 days. The nature of the pain is diffuse and intensifies during respiration, although it does not radiate. His shortness of breath worsens when lying on his left side but improves when sitting upright. Notably, the patient has undergone two rounds of chemotherapy. He denies experiencing cough or wheezing, and although he has a loss of appetite, there has been no significant weight loss. In light of these symptoms, what are the potential differential diagnoses that can be considered based on the findings from the chest X-ray?