A 37-year-old man presented with fever and productive cough for 3 days

A 37-year-old man presented with fever and productive cough for 3 days.
He was febrile, hypoxic and physical examination showed focal decrease in air entry and coarse crepitations over the right lower chest.
Laboratory investigations revealed leukocytosis and a CXR was performed. What is the most likely diagnosis ?

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  1. Pneumonia
  2. Lung Abscess
  3. Empyema
  4. Pleural Effusion