A 55-year-old man presents to the outpatient continuity clinic with a 4-day history of lower back pain. He describes the pain as a dull ache in the lumbar region that started gradually. He works as an accountant and denies any recent falls or major trauma. The physician conducts a comprehensive medical history evaluation to determine the appropriate diagnostic and management plan. Which of the following historical findings, if reported by the patient, would be considered 'red flag' symptoms that correctly prompt urgent diagnostic imaging? (Select all that apply)
- New-onset bowel or bladder incontinenceAnswer
- BPain radiating down the posterior aspect of the left thigh to the knee
- Unintentional weight loss of 5 kg (11 lbs) over the past monthAnswer
- DExacerbation of pain when bending forward to tie shoes
- EFailure to achieve complete pain relief with over-the-counter ibuprofen
Answer
The correct historical findings that warrant urgent imaging are new-onset bowel or bladder incontinence and unintentional weight loss.
Evaluating a patient's medical history for 'red flags' is the most critical step in managing acute low back pain. New-onset bowel or bladder incontinence strongly suggests cauda equina syndrome, a neurologic emergency that requires immediate MRI to prevent permanent deficit. Unintentional weight loss is highly suspicious for systemic disease, particularly metastatic malignancy to the spine, which also mandates urgent imaging to guide appropriate intervention.
Step-by-Step Solution
Key Concept
Identification of clinical 'red flags' during the medical history evaluation of acute low back pain to appropriately triage the need for urgent diagnostic imaging.