Pleural effusion associated with a psoas abscess dissecting through the posterior abdominal wall

A 24-year-old man presented with a pleural effusion in the left side.A presumptive diagnosis of parapneumonic effusion was made and antibiotic therapy was started. Over the following days, a subcutaneous soft tissue mass was developed in the left lumbar region.The CT scan examinations disclosed a psoas abscess and fluid collection in the subcutaneous soft tissues in the left side.The patient was successfully treated with incision and ultrasound-guided percutaneous drainage and antibiotics.