Apical pulmonary hydatid cyst: About a rare cause of Pancoast syndrome

Objectives: Our purpose is to illustrate the radiological aspects of an apical hydatid cyst as a rare cause of Pancoast Tobias syndrome.
Material: We report the case of a 35 years-old man, who was admitted to our department with a Pancoast tobias syndrome.
Results: The patient presented to our department with a history of shoulder and right chest pain radiating downward toward the ulnar side of his homolateral arm. He also reported hemoptysis and hydatidemesis (hydatid cysts and membranes in the vomitus).
Radiological investigations suggested the diagnosis of hydatid cyst of the left lung apex which was confirmed by surgical excision and pathological examination of the lesion. This case highlights an uncommon etiology of Pancoast syndrome which might mislead physicians in their practice.
Conclusion: In conclusion, a primary hydatid cyst should be considered in the differential diagnosis of Pancoast's syndrome especially in endemic regions.
Unlike Pancoast tumors, this benign lesion has a very favourable prognosis and good surgical results.