[The association of pleural empyema and perinephritic infection: apropos 4 cases].

: Empyema of renal origin is very rare (3% in our series). We discuss 4 cases of empyemas associated to perirenal infection. Two of them were diabetic and all of them have renal lithiasis. They made their debut through pleural effusions, isolating Escherichia coli in all of them. Treatment was antibiotics and drainage in both foci, three of them evolved to healing and one of them died being the abdominal foci without drainage. This association must be suspected when no clear etiology of the empyema is present in patients with history of renal lithiasis and diabetes.