A 22-year-old male complains of difficulty breathing after being struck in the chest with a pipe. He has a six-inch bruise over his right axilla. His lung sounds are absent on the right lower chest. His vital signs are P 122, R 20, BP 88/72, and SpO2 is 94. What is the most likely diagnosis?
1) Pneumothorax
2) Hemothorax
3) Pulmonary contusion
4) Rib fracture