Summary: Iliopsoas abscess is uncommon in the postpartum period. This case illustrates the presentation of this unusual cause of postpartum sepsis and highlights difficulties in diagnosis.Keywords: maternal mortality, ultrasound
CASE HISTORYA 31-year-old caucasian lady, para 4 þ 2, presented with left iliac fossa pain and rigors at four weeks postpartum following an unremarkable pregnancy. She delivered spontaneously at home with no midwife present. The placenta was delivered two hours after by a community midwife with no significant blood loss.Her presenting complaint was constant, severe left-sided lower abdominal pain radiating to the anterior aspect of the upper part of the thigh, becoming progressively more severe over the previous four weeks. This was associated with fever, rigors and vomiting for the past seven days. She described mild dysuria, but no bleeding or discharge per vaginum, and no respiratory or bowel symptoms. She was not breast feeding and had no mastalgia. There was no past history of diabetes, HIV, renal problems, trauma or gait problems. The patient was noted to have an allergy to penicillin.On admission, temperature was 38.68C, pulse rate 117 bpm and blood pressure 117/74 mmHg. On examination, the abdomen was soft with extreme tenderness over the left iliac fossa and groin. There was no guarding, rebound or renal angle tenderness. There were no clinical features of deep venous thrombosis. The chest and heart sounds were normal. Speculum examination visualized a normal cervix with no bleeding or discharge. Bimanual vaginal examination revealed an anteverted uterus and left adnexal tenderness but no masses. Examination of both hips and neurological examination of the lower limbs was unremarkable.Her blood tests were consistent with a diagnosis of sepsis with a raised white cell count, C reactive protein and elevated platelet count. A normocytic anaemia was also noted with haemoglobin of 6.9 g/dL. Midstream urine was positive for nitrites on dipstick testing, whereas a urinary pregnancy test was negative. Multiple cultures of blood and urine taken before antibiotics were commenced showed no growth after 72 hours. High vaginal and endocervical swabs were also negative. The patient was rehydrated and commenced empirically on intravenous ceftriaxone and metronidazole. In view of symptoms of dizziness, the patient was transfused three units of blood. Transvaginal pelvic ultrasound was unremarkable showing no evidence of a collection of retained products.Despite antibiotics, the pain and spikes in temperature persisted. Although inflammatory markers remained raised, the patient remained clinically stable and a further transvaginal ultrasound could not locate the cause of sepsis. On the third day after admission, as symptoms had not resolved, a computed tomography (CT) of the abdomen and pelvis was performed. This revealed a left iliopsoas abscess extending down into the left groin (Figure 1). The pus-filled abscess cavity was drained percutaneously under ultrasound guidance without complication....