Pancoast Tumor: The Overlooked Etiology Of Shoulder Pain In Smokers

Objective: Mistake in diagnosisBackground: Shoulder pain is a common complaint in general practice and typically has an orthopedic or rheumatological etiology. However, it may be the presenting symptom of a serious underlying condition, such as lung cancer.Case Report: A 60-year-old man with a 30 pack-year history of smoking presented with worsening right shoulder pain over the last 6 months. He had no respiratory symptoms or weight change. He was seen at several general practice clinics and treated for a rotator cuff injury. However, his pain became severe, to the point that it affected his activities of daily living. A shoulder X-ray revealed opacity in the right apical zone. After a thorough investigation, the patient was found to have lung cancer with local invasion and intracranial metastases. However, in light of the advanced stage of the disease, a palliative approach was taken. The patient remained on multiple oral analgesics for the control of his pain.Conclusions: The present case shows that common symptoms such as shoulder pain can be indicative of serious underlying pathology. Physicians should remain alert and maintain a high index of suspicion for Pancoast tumor in patients who are heavy smokers. Furthermore, a chest X-ray needs to be performed in elderly patients and smokers with shoulder pain.