Unveiling the Mystery of Horseshoe Lung: A Case Report.

Horseshoe lung is a rare congenital anomaly where the lower lung segments fuse behind the heart, posing diagnostic challenges that require advanced imaging. In a case involving a 33-year-old male presenting to primary care with left-sided chest pain, an abnormal chest X-ray revealed reduced lung volume and a cystic structure on the left. A CT scan confirmed a small, hypoplastic left lung and compensatory right lung expansion and fusion, leading to a diagnosis of horseshoe lung. The patient, with no significant medical history and normal vital signs, was asymptomatic when seen in the pulmonology clinic and scheduled for routine follow-up. First identified in 1962, horseshoe lung can be confused with other conditions due to its overlapping features. The exact embryological origins are unclear, but advanced imaging such as multidetector computed tomography (MDCT) is essential for accurate diagnosis. Effective management of horseshoe lung requires a multidisciplinary approach and advanced imaging for precise diagnosis and treatment. Further research is needed to understand its embryological origins.