Girl, 5, With Fever and Hip Pain

CONCLUSION
Since children generally compensate well during times of increased stress on the body, it is vital that persistent FUOs continue to be evaluated until a definitive source is identified, especially in this population. Early diagnosis and treatment of psoas abscess is essential for better outcomes, since delay is associated with a greater risk for sepsis.

While the likelihood of developing psoas abscess is low, it is worth keeping the diagnosis in mind for cases of unexplained lower abdominal pain, flank pain, or hip pain when more common etiologies have been excluded. This is especially important in the setting of recent travel to a developing country due to the fact that a psoas abscess can be a complication of TB of the spine.

The authors would like to thank Jeff Brand, MD, for his assistance in the preparation of this manuscript.

REFERENCES
1. Wong-Baker Faces Corporation. Wong-Baker FACES Pain Rating Scale. www.wongbakerfaces.org. Accessed May 19, 2015.
2. Mallick IH, Thoufreeq MH, Rajendren TP. Iliopsoas abscesses. Postgrad Med J. 2004;80(946):459-462.
3. Yacoub WN, Sohn HJ, Chan S, et al. Psoas abscess rarely requires surgical intervention. Am J Surg. 2008;196(2):223-227.
4. Lopez VN, Ramos JM, Meseguer V, et al; The Infectious Diseases Study Group of the Spanish Society of Internal Medicine. Microbiology and outcome of iliopsoas abscess in 124 patients. Medicine. 2009;88(2):120-130.
5. Shields D, Robinson P, Crowley TP. Iliopsoas abscess—a review and update on the literature. Int J Surg. 2012;10(9):466-469.
6. Tabrizian P, Nguyen SQ, Greenstein A, et al. Management and treatment of iliopsoas abscess. Arch Surg. 2009;144(10):946-949.
7. Dietrich A, Vaccarezza H, Vaccaro CA. Iliopsoas abscess: presentation, management, and outcomes. Surg Laparosc Endosc Percutan Tech. 2013;23(1):45-48.
8. Wong OF, Ho PL, Lam SK. Retrospective review of clinical presentations, microbiology, and outcomes of patients with psoas abscess. Hong Kong Med J. 2013;19(5):416-423.
9. Woo MY. Psoas abscess. J Emerg Med. 2014;47(5):e129-e130.