Fibrosing mediastinitis (FM), which is also known as mediastinal fibrosis or sclerosing mediastinitis, is an uncommon, benign and progressive condition characterized by an invasive proliferation of fibrous tissue within the mediastinum. Tuberculosis and histoplasmosis are the major causes of the granulomatous variety, while non-granulomatous FM is an idiopathic reaction to autoimmune syndromes, drugs and radiation. Contrast-enhanced CT is the investigation of choice that can diagnose, and assess the extent and the severity of involvement. We are presenting a case of FM in a young female who presented with complaints of breathlessness, occasional cough and diffuse chest pain for 3 months.