Lung malignancies have become increasingly prevalent. Occasionally, an unusual tumour is diagnosed, or a common tumour type presents unusually. This case report reviews 3 cases of thoracic neoplasm, including two cases of uncommon cancers (primary lung adenoid cystic carcinoma and thoracic desmoplastic small round cell high-grade sarcoma) and an atypical presentation of malignant mesothelioma.