RD5.3 | Emergency X-ray Interpretation in Chest, Abdomen and Skeleton — Summary & Reflection

KEY TAKEAWAYS

Emergency X-ray Interpretation — Key Points

• Emergency reading = the systematic read with a targeted first pass for the killers, then the complete read; detection is coupled to immediate action.
• Projection is the master rule: free air and air–fluid levels need an ERECT/horizontal-beam film (erect CXR or left-lateral decubitus). A negative SUPINE film does NOT exclude free air.
• Pneumoperitoneum = free air under the diaphragm (erect CXR) or the Rigler (double-wall) sign (supine AXR) → suspect perforated viscus → urgent surgery. Mimics: Chilaiditi (haustra in the gas), normal left-sided gastric bubble.
• Bowel obstruction: small bowel = central loops, valvulae conniventes cross the full lumen, >~3 cm, central stepladder levels; large bowel = peripheral loops, haustra do not cross, >~6 cm (caecum >~9 cm). The 3/6/9 rule.
• Acute vs chronic fracture: acute = sharp, non-corticated lucent line + soft-tissue swelling; chronic/old = sclerotic, rounded, corticated margins, no swelling (callus/remodelling). Always read soft tissues; always two orthogonal views.
• Tension pneumothorax is a CLINICAL diagnosis — decompress immediately if evident; on film, lung edge with absent peripheral markings and mediastinal shift AWAY from the affected side.
• Each finding has an action: pneumoperitoneum → surgery; obstruction → resuscitate/decompress/refer; acute fracture → reduce/immobilise + neurovascular check; tension pneumothorax → immediate decompression.

REFLECT

Picture your next night in casualty with a stack of films and a queue of patients. (1) Have you made 'check the projection — is this erect?' an automatic first step before you ever comment on free air or a fluid level? (2) Could you, under time pressure, run a targeted first pass for pneumothorax, free air, dilated bowel and fracture, and STILL complete the full systematic read so you do not miss a second finding? (3) For every emergency sign you can name — pneumoperitoneum, obstruction, acute fracture, tension pneumothorax — do you also know the immediate action it triggers, and the mimic that could fool you? Rehearsing the detection-plus-decision pairing now is what lets you act safely and fast when the film in your hand is the only one you will get before the patient deteriorates.