# Traumatic Diaphragmatic Injury

> Traumatic diaphragmatic injury for NEET-PG Surgery: left-sided preponderance, delayed herniation with strangulation, NG tube in chest and repair routes.

- Canonical URL: https://prepelephant.com/topics/neet-pg/surgery/traumatic-diaphragmatic-injury
- Exam / course: NEET-PG · Subject: Surgery
- Publisher: PrepElephant (https://prepelephant.com) — Prepared and reviewed by the PrepElephant Academic Review Team
- First published: 2026-10-02
- Last updated: 2026-10-02
- How to cite: "Traumatic Diaphragmatic Injury", PrepElephant, https://prepelephant.com/topics/neet-pg/surgery/traumatic-diaphragmatic-injury

## Direct answer

Blunt deceleration ruptures the diaphragm on the left side in roughly two-thirds to three-quarters of cases — the liver cushions the right — while penetrating thoracoabdominal wounds create defects of any size that, like all traumatic diaphragmatic injuries, never heal spontaneously. The acute phase threatens associated visceral injury; the delayed phase, months or years later, threatens strangulation of herniated bowel. Acute injuries are repaired through a laparotomy (which also excludes hollow viscus and solid organ damage), whereas chronic delayed hernias are approached through the chest.

## What you must remember

- Left-sided preponderance in blunt trauma (about 2:1 or more) because the liver buttresses the right hemidiaphragm; penetrating injuries occur wherever the missile or blade crosses.
- The defect never closes spontaneously: the pleuroperitoneal pressure gradient (abdominal pressure exceeding intrathoracic) progressively sucks viscera into the chest.
- Initial chest radiograph is normal or non-specific in a substantial proportion; suspicion from mechanism matters more than a clean early film.
- Radiological tells: stomach bubble or bowel gas above the diaphragm, coiled nasogastric tube in the left chest, an apparently high or blurred diaphragm, and mediastinal shift.
- Delayed presentation: post-prandial pain, vomiting, breathlessness after a remotely forgotten road accident, with gastric volvulus or strangulated bowel on imaging — the classic "late caller".
- Associated injuries dominate the acute phase: splenic and hepatic injury, rib fractures, pelvic fractures and hollow viscus perforation in blunt trauma.
- Acute repair: laparotomy, gentle reduction of viscera, trimming of ragged edges, primary closure with non-absorbable interrupted sutures; prosthetic mesh for large defects or chronic attenuation.
- Chronic hernia: thoracotomy or thoracoabdominal approach for adhesolysis and repair, occasionally requiring a patch.
- Laparoscopy is both diagnostic and therapeutic in stable penetrating left thoracoabdominal trauma — diaphragmatic injury is frequently missed otherwise.

## A delayed case that makes the topic memorable

Eight months after a head-on collision treated at a peripheral centre, a 34-year-old man develops sudden left chest and epigastric pain with vomiting after a heavy meal. The chest radiograph shows multiple air-fluid levels in the left hemithorax with mediastinal shift; a nasogastric tube passes into the chest before it reaches the stomach — the single most quotable sign of diaphragmatic rupture with gastric herniation. A CT scan with multiplanar reformats shows the stomach, omentum and splenic flexure above an interrupted left diaphragmatic shadow, and contrast studies confirm a volved stomach.

Because he is stable and the injury is old, the operation is planned through the left chest: adhesions between viscera and lung are taken down, the stomach and colon are reduced (decompressing the stomach first with a nasogastric tube), the edges of the defect are freshened, and the rent is closed with non-absorbable sutures; a mesh reinforces the repair because chronic dilation has thinned the crura. Had the same defect declared itself on the day of the accident — with a shocked patient and a positive FAST scan — the route would be a midline laparotomy: reduce, repair, and systematically exclude splenic injury and bowel perforation before closing.

## Where students slip

The first slip is treating a normal early chest radiograph as reassurance: small ruptures seal themselves with omentum initially and present years later, which is exactly why a "forgotten" mechanism in the history is diagnostic gold. The second is choosing the wrong approach for the wrong phase — answering "thoracotomy" for an acute blunt case misses the intra-abdominal injuries that will kill the patient first, while answering "laparotomy" for a chronic case underestimates the intrathoracic adhesions that make reduction from below hazardous. The viva trap is the congenital differential: Bochdalek hernia is posterolateral and left-sided in infants, Morgagni is anterior and right-sided, and oesophageal hiatus hernia has its own logic — traumatic rupture has no such tidy site preference beyond the left-sided tendency, and sits at the dome or posteriorly.

## Frequently asked questions

### Why is the left hemidiaphragm ruptured more often in blunt trauma?
The liver absorbs impact forces shielding the right side, and the left hemidiaphragm's posterior weak point gives way — roughly a 2:1 or greater left preponderance.

### Do traumatic diaphragmatic defects heal on their own?
No — the constant positive abdominothoracic pressure gradient keeps them open and slowly widens them, making delayed herniation inevitable without surgical repair.

### Which radiological sign is characteristic of gastric herniation?
A coiled nasogastric tube passing into the left hemithorax instead of the subdiaphragmatic stomach, often with bowel gas or air-fluid levels above the diaphragm.

### Why is laparotomy preferred in acute injuries?
Associated intra-abdominal injuries — splenic and hepatic bleeding, bowel perforation — must be excluded and treated in the same anaesthetic, and visceral reduction is easier from below.

### How does a delayed diaphragmatic hernia present?
Post-prandial pain, vomiting and breathlessness months to years after trauma, occasionally as an emergency with gastric volvulus or strangulated bowel in the chest.

### What is the role of laparoscopy in suspected injury?
In stable patients with penetrating left thoracoabdominal wounds, diagnostic laparoscopy detects small diaphragmatic lacerations reliably and permits immediate repair — closing a well-known blind spot of non-operative assessment.