Pulmonary hydatid disease remains an important healthcare problem in children. We report a case report of a 4-year-old child with chronic cough and hemoptysis for 2 months. he had no contact with dogs. Pleuropulmonary examination showed well-transmitted bladder murmurs and well-perceived vocal vibrations. The diagnosis of pleuropneumopathy was retained and the patient was treated with amoxicillin - acid clavulanic antibiotic therapy. In front of non-clinical improvement, ultrasound showed a left basal, rounded, thickened-walled, non-vascularized, non-doppler, single loculate basal cyst formation which is related to a hydatic cyst . Surgey consisted of a left posterolateral thoracotomy associated with a puncture-evacuation of the contents of the hydatic cyst, an exterioration of the proligeus membrane. The recovery was good.