Psoas abscess
Background
- Psoas muscle is susceptible to infection from distant sites due to rich blood supply, proximity to overlying retroperitoneal lymphatic channels
- S. aureus is most common pathogen (80%)
Clinical Features
- Abdominal pain radiating to hip, flank
- Pain with thigh flexion (esp against resistance)
- Limp
- Fever
- Nausea
Differential Diagnosis
RLQ Pain
- Appendicitis
- Abdominal aortic aneurysm
- Crohn's disease (terminal ileitis)
- Diverticulitis (cecal, Asian patients)
- Ectopic
- Endometriosis
- Epiploic appendagitis
- Herpes zoster
- Inguinal hernia
- Ischemic colitis
- Kidney stone
- Meckel's diverticulum
- Mesenteric lymphadenitis
- Mittelschmerz
- Neutropenic enterocolitis (typhlitis)
- Ovarian cyst
- Ovarian torsion
- PID
- Pyelonephritis
- Psoas abscess
- Testicular torsion
LLQ Pain
- Diverticulitis
- Kidney stone
- UTI
- Pyelonephritis
- Ectopic Pregnancy
- Infectious colitis
- Inflammatory bowel disease (Crohn's Disease, Ulcerative Colitis)
- Inguinal Hernia
- Mesenteric Ischemia
- Epiploic appendagitis
- Mittelschmerz
- Ovarian cyst
- Ovarian torsion
- PID
- Psoas abscess
- Testicular torsion
- Appendicitis
- Abdominal aortic aneurysm
- Herpes zoster
- Endometriosis
- Colon cancer
- Irritable bowel syndrome
- Small bowel obstruction
Evaluation
- CT is imaging study of choice
Management
- Antibiotics
- Vancomycin plus
- Piperacillin/tazobactam 3.375g, OR
- Ceftriaxone + Metronidazole
- Surgical consultation
See Also
References
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