Synopsis
Interpret an adult chest radiograph systematically, recognise urgent thoracic abnormalities, account for technical limitations, and turn an imaging pattern into a safe clinical action rather than an unsupported final diagnosis.
- Confirm patient, date, indication and comparison films before interpretation; a correct description attached to the wrong patient or old image is still a dangerous error.
- Judge image quality first using projection, rotation, inspiration, exposure and coverage, because portable AP technique, supine position and poor inspiration can mimic cardiomegaly, basal opacity or vascular congestion.
- Use a reproducible search pattern: airway and mediastinum, lungs and pleura, cardiac silhouette and hila, diaphragms and upper abdomen, then bones, soft tissues and every line or device.
- Describe an opacity by side, zone, density, border, distribution and evidence of volume loss before naming a cause; consolidation, collapse, fluid, mass and artefact demand different next steps.
- A pleural line with absent peripheral lung markings supports pneumothorax, but skin folds and scapular edges can imitate it; reconcile the line with physiology and obtain urgent expert review when uncertain.
- Look deliberately at review areas: apices, hila, retrocardiac region, costophrenic angles, below the diaphragms and behind projected devices; these are common hiding places for clinically important disease.
- Trace tubes and lines from origin to tip and assess complications, not just the tip location; an apparently acceptable device may coexist with pneumothorax, malposition or a new effusion.
- End with an impression, degree of confidence and action: compare prior imaging, identify the report owner, and escalate discordance between the image, formal report and clinical condition. Definitive reporting follows local radiology pathways.
- A normal or non-diagnostic radiograph does not exclude pulmonary embolism, early infection, small pneumothorax, asthma, interstitial disease or endobronchial obstruction; choose further testing from the unresolved clinical question.
Key red flags
A sharp visceral pleural line with no lung markings beyond it supports pneumothorax. In a supine patient, pleural air may collect anterobasally and produce an abnormally deep costophrenic sulcus rather than a classic apical line. Mediastinal shift is a late radiographic clue and tension remains a clinical diagnosis.
Volume loss is the discriminator: fissural, hilar or mediastinal displacement, elevated hemidiaphragm, rib crowding and compensatory hyperinflation support atelectasis. New unexplained lobar collapse, especially in an adult smoker, requires timely assessment for an obstructing tumour or mucus plug.
Cardiomegaly, upper-zone vascular diversion, septal lines, perihilar or diffuse air-space shadowing and bilateral effusions support cardiogenic oedema, but not every feature is present and AP magnification can exaggerate heart size. Non-cardiogenic oedema may occur without cardiomegaly.
Investigation priorities
Determine whether projection, position, rotation, inspiration, exposure or incomplete coverage could create or conceal the apparent abnormality.
Management branches
Every chest radiograph before diagnostic interpretation.
- Confirm patient identifiers, acquisition date and time, indication, side markers and whether a relevant earlier image is available.
- Identify PA or AP projection, erect or supine position, rotation, inspiratory volume, penetration and anatomical coverage, recording any limitation that changes confidence.
- Review the patient's observations and oxygen requirement so that a technically subtle finding is weighted appropriately and a clinically unstable patient is not left waiting for image analysis.