Spontaneous expectoration of an isolated pulmonary hydatid cyst.

A 30-year-old woman presented with left-sided dull chest pain, productive cough and weight loss for 2 years. She denied fever, dyspnoea, night sweats or contact with patients afflicted by tuberculosis. Initial sputum workup was negative for tubercular, bacterial and fungal aetiologies, and a chest X-ray was unremarkable. CT scan of the lung revealed a large thick walled cyst in the left lower lobe, without any internal contents or …