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Primary pulmonary leiomyosarcomas are rare and diagnostically challenging group of neoplasms approximately constituting 0.2-0.5% of all primary lung malignancies. They originate from the smooth muscle cells of the bronchial wall, blood vessels or from the pulmonary interstitium. Here we present a case of 45 year old male with history of chronic cough, breathlessness and chest pain for few months. Clinical and radiological workup showed a left upper lobe lung mass. Endobronchial ultrasound guided (EUS) needle biopsy of the mass on histopathology confirmed leiomyosarcoma. Further through evaluation ruled out the possibility of metastasis. A final diagnosis of primary leiomyosarcoma of lung was made and patient was planned for surgical management.