Radiograph Review in Clinical Practice
Chest radiography (posteroanterior and lateral views) should be obtained as the initial imaging study for most clinical presentations requiring radiographic evaluation, with systematic review focusing on cardiac silhouette, mediastinal contours, pulmonary vascularity, pleural spaces, osseous structures, and soft tissues 1, 2, 3.
Approach to Radiograph Interpretation
Initial Assessment Framework
When reviewing any radiograph, follow this systematic approach:
For Chest Radiographs:
- Cardiac/mediastinal evaluation: Assess cardiac size, contour abnormalities, mediastinal widening, and position of great vessels
- Pulmonary parenchyma: Look for infiltrates, masses, nodules, or interstitial changes
- Pleural spaces: Identify effusions (requiring lateral decubitus views if small), pneumothorax, or pleural thickening
- Osseous structures: Examine ribs (particularly 3rd-9th for trauma), spine alignment, and sternum
- Soft tissues: Note subcutaneous emphysema, chest wall masses, or asymmetry 1, 4, 5
For Spine Radiographs:
- Alignment: Assess for deformity, subluxation, or loss of normal curvature
- Bone integrity: Look for fractures, destruction, or sclerosis
- Disc spaces: Evaluate height and regularity
- Soft tissue shadows: Note prevertebral swelling or masses 6
Clinical Context-Specific Considerations
Acute Presentations
Trauma scenarios: Chest radiography detects critical complications (pneumothorax, hemothorax, flail chest, cardiac contour changes) even when missing 50% of rib fractures, as fracture detection rarely changes management in uncomplicated cases 5, 4. The radiograph's value lies in identifying life-threatening complications rather than cataloging every fracture.
Suspected pneumonia: Standard PA and lateral chest radiographs differentiate pneumonia from mimicking conditions and identify multilobar involvement, pleural effusions, or lung abscesses. However, radiographs may be negative in early disease or dehydrated patients 3, 7.
Chronic Presentations
Chronic dyspnea: Radiography serves as the reasonable initial study, revealing pleural effusions, structural chest wall abnormalities, diaphragm position abnormalities, and lung volume changes. PA and lateral views are superior to AP portable films when feasible 1, 2.
Back pain with red flags: Radiographs have low sensitivity for infection or malignancy but provide rapid assessment in urgent settings for osseous destruction or alignment changes. Proceed directly to MRI with and without contrast when suspecting neoplasm or infection 6.
Common Pitfalls and Limitations
When Radiographs Are Insufficient
Do not rely solely on radiographs when:
- Suspected diaphragm dysfunction (fluoroscopy or ultrasound provides dynamic assessment) 2
- Evaluating pleural septations (ultrasound superior to radiography and CT) 1
- Assessing interstitial lung disease (CT required; normal radiograph doesn't exclude disease) 2
- Trauma with high clinical suspicion despite negative films (CT detects 80% more hemothoraces and 50% more fractures) 4
Technical Quality Matters
Optimal radiographic technique requires:
- PA and lateral projections when possible (not AP portable)
- Proper patient positioning and inspiration
- Comparison with prior studies for chronicity assessment
- Recognition that heavy body habitus, overlying devices, and motion artifacts limit interpretation 4, 5
Quality Assurance
Radiologist over-read remains standard practice, though studies show emergency physician confident interpretations have only 1.2% discordance rates, with 0.1% clinically significant missed findings 8. However, systematic peer review improves quality through standardized expectations and awareness of assessment 9, 10.
Advanced Imaging Triggers
Proceed directly to CT when:
- Radiographs show bone destruction, significant deformity, or concerning findings requiring detailed osseous assessment 6
- Clinical suspicion remains high despite negative radiographs in trauma 5, 4
- Evaluating central airway disease or suspected interstitial lung disease 2
Proceed directly to MRI when:
- Red flag symptoms present (fever, weight loss, immunosuppression, known malignancy) 6
- Neurologic deficits accompany back pain 6
- Suspected soft tissue or neural structure involvement 6
The radiograph remains the cornerstone initial imaging study across most clinical scenarios, but its limitations must be recognized and advanced imaging obtained without delay when clinical context demands more detailed evaluation.