A 17-year-old female visited the clinic complaining of short…
A 17-year-old female visited the clinic complaining of shortness of breath. She had a history of frequent infections during childhood. Physical examination revealed that respiratory sounds were absent in the left hemithorax. Routine blood and biochemical test values were within normal limits. Chest radiography revealed that mediastinal structures, trachea, and heart were deviated to the left and the right hemidiaphragm was elevated (see figure). Abnormal development of which of the following best explains the clinical findings in this patient?