<unk>  is an unusual type of<unk>  in surgical practice. It is often underdiagnosed due to the insidious onset of symptoms and its location in the retroperitoneal space making it hard to be assessed via the regular abdominal examination.
It is most often due to Genitourinary infection (Pyelonephritis) or gastrointestinal cause (i.e Inflammatory Bowel Syndrome).
CT & MRI are the cornerstones for diagnosis.
Treatment is usually focused on surgical drainage either through open or percutaneous approaches usually accompanied with the use of IV antibiotics.
Retroperitoneal abscess
Retroperitoneal hematoma
Retroperitoneal fibrosis
Psoas abscess
Appendicular abscess
Hydrocele testis
Testicular torsion
Ovarian torsion