BACKGROUND Psoas abscess is a challenging disease that may sometimes lead to a devastating prognosis. Early diagnosis and treatment are mandatory for better results in their treatments and to avoid complications. OBJECTIVE There is no article regarding a fibrosis treatment of the psoas muscle with a psoas abscess that is treated with full endoscopic debridement (FED). METHODS a case report and literature review. RESULTS we successfully treated this case, who suffered from psoas fibrosis with a clinical and MRI diagnosis, with full endoscopic debridement. CONCLUSIONS FED is a viable alternative to open debridement for this rare complication of a psoas muscle abscess.