For a patient with a one‑month right parietal headache radiating to the jaw and mouth, poor dentition, and a recent sinus infection treated with amoxicillin, what imaging should be ordered in primary care?

Imaging Recommendation for Right Parietal Headache with Jaw Pain

Order CT maxillofacial (paranasal sinuses) with IV contrast immediately to evaluate for intracranial complications of sinusitis, given the severe headache persisting one month after treatment. 1

Clinical Reasoning

This patient presents with red flags that mandate urgent imaging:

• Severe headache lasting one month despite antibiotic treatment suggests possible intracranial complication rather than uncomplicated sinusitis 1
• Parietal location with radiation to jaw/mouth raises concern for epidural abscess, subdural empyema, or meningitis—complications that most commonly occur with frontal sinusitis but can present with severe headache 1
• Poor dentition introduces the possibility of odontogenic sinusitis (present in 25-40% of maxillary sinusitis cases), which has higher rates of extension and treatment failure 2

Specific Imaging Protocol

CT maxillofacial with IV contrast is the appropriate first-line study because:

• It accurately identifies intracranial complications (epidural abscess, subdural empyema, cerebritis, brain abscess) with 87% accuracy 1
• It demonstrates orbital complications with 87-91% accuracy 1
• It evaluates both the sinuses AND adjacent intracranial structures in a single study 1
• Contrast enhancement is essential when complications are suspected, as it significantly improves detection of abscess formation and meningitis 1, 3

Add CT head with IV contrast if the maxillofacial field of view does not adequately cover the parietal region where the headache is localized 1

Why This Patient Does NOT Have "Uncomplicated" Sinusitis

The American College of Radiology explicitly states that imaging should be reserved for cases with clinically suspected complications 1. This patient has multiple features suggesting complications:

• Severe headache is listed as a specific symptom suggesting intracranial involvement 1
• One-month duration despite amoxicillin treatment indicates treatment failure 1
• The combination of poor dentition and persistent symptoms raises concern for odontogenic source with extension 2

Critical Pitfalls to Avoid

Do NOT order non-contrast CT alone in this scenario—while non-contrast CT is appropriate for uncomplicated sinusitis or surgical planning, it has limited sensitivity for detecting intracranial complications compared to contrast-enhanced studies 1, 3

Do NOT delay imaging by treating with additional antibiotics first—intracranial complications require urgent diagnosis to prevent permanent neurological deficit or death 4

Consider MRI with contrast as a complementary or alternative study if CT findings are equivocal, as MRI has superior accuracy (97% vs 87%) for detecting intracranial complications, particularly early cerebritis, meningitis, and cavernous sinus thrombosis 1, 3

Dental Evaluation

Given the poor dentition and odontogenic sinusitis prevalence, ensure the CT maxillofacial protocol includes evaluation of the maxillary dentition and alveolar process 2. Look specifically for:

• Periapical inflammatory lesions 2
• Oroantral communication 2
• Bone erosion at tooth roots adjacent to maxillary sinus floor 2

If Imaging is Negative

If CT with contrast shows only uncomplicated sinusitis without complications, then the persistent headache requires alternative diagnostic consideration beyond rhinosinusitis, and the patient may need neurological evaluation for primary headache disorder.