Pyogenic abscess of the psoas muscle is a rare disease. The Authors
report a recently observed case which developed 10 years after ipsilateral nephrectomy for pyonephrosis, reviewing the pertinent literature.
The culture of the pus extracted only reproduced Proteus mirabilis. The
relation between psoas abscess and nephrectomy is unclear. To make
diagnosis is important to consider this condition in differential diagnosis in presence of fever and flank tenderness in a nephrectomized patient
