Congenital diaphragmatic hernias usually present in infancy. Bochdalek hernias are rare forms of congenital diaphragmatic hernias and their symptomatic presentation in adulthood is a rare entity. Herein we present a middle-aged man with Bochdalek hernia mimicking as pleural effusion. Imaging workup revealed herniation of the abdominal contents into the thoracic cavity through the defect in the diaphragm. Patient was managed surgically and followed up. High degree of suspicion is warranted for prompt diagnosis and to avoid misdiagnosis and treatment which may cause increased mortality and complications