Recurrent Venous Thromboembolism in a Young Adult: A Case Report and Comprehensive Review of Diagnostic Approaches.

Primary lung adenocarcinoma is a rare but critical diagnosis in young adults, often presenting with atypical symptoms. We report the case of a 29-year-old male with no significant medical history who initially presented with deep vein thrombosis (DVT) and recurrent pulmonary emboli (PE) despite appropriate anticoagulation. Further workup ultimately revealed metastatic lung adenocarcinoma, diagnosed post-mortem. This case underscores the importance of considering occult malignancy in young patients with unprovoked or recurrent venous thromboembolism. Early recognition of underlying cancer in such atypical presentations may facilitate earlier diagnosis and intervention, potentially improving patient outcomes.