Traumatic diaphragmatic hernia represents a critical yet frequently overlooked consequence of blunt thoracoabdominal injury. Because acute injuries often mask internal tears, patients may remain asymptomatic for months or even decades. When symptoms eventually manifest, they commonly resemble chronic respiratory illnesses, causing significant diagnostic confusion. In many clinical scenarios, clinicians misidentify the herniated abdominal viscera as an intrathoracic malignancy or pleural disease. This dilemma becomes especially pronounced when a patient has a history of cancer, such as breast carcinoma. Therefore, clinicians must maintain high suspicion when encountering atypical lower thoracic lesions. Recognizing subtle indicators helps physicians avert hazardous diagnostic delays and inappropriate invasive interventions.

Clinical Presentation and the Diagnostic Dilemma

Patients suffering from chronic diaphragmatic rupture present with diverse and nonspecific clinical manifestations. Typical symptoms include progressive exertional dyspnea, wheezing, shoulder discomfort, and intractable dry cough. In a notable case, a 69-year-old woman presented with persistent wheezing lasting over six months, accompanied by worsening cough. External chest imaging demonstrated a massive soft-tissue mass in the right lower hemithorax with pleural effusion. Because she had a documented history of breast cancer, the treating team suspected malignant intrathoracic recurrence. Consequently, clinicians initiated an oncology workup, which diverted focus away from anatomical diaphragmatic rupture.

Furthermore, physical examination findings often mislead treating physicians. Clinicians may detect diminished breath sounds and dullness to percussion over the affected hemithorax, classically suggesting consolidation or effusion. Bowel sounds over the thorax remain absent when solid organs like the liver herniate. Consequently, healthcare providers frequently perform routine thoracentesis rather than evaluating diaphragmatic architecture. Fluid analysis typically shows non-malignant, reactive fluid, further obscuring the underlying structural defect.

Why Traumatic Diaphragmatic Hernia Is Easily Overlooked

A right-sided traumatic diaphragmatic hernia occurs far less frequently than a left-sided injury. Anatomically, the massive right lobe of the liver shields the hemidiaphragm, absorbing blunt kinetic energy and plugging minor lacerations. Consequently, right-sided tears remain clinically silent during initial post-trauma hospitalizations. Over subsequent months or years, however, the pressure gradient between the negative intrathoracic cavity and positive intra-abdominal compartment draws abdominal structures upward. Gradually, hepatic parenchyma migrates into the pleural space, producing a progressive mass effect.

Additionally, emergency teams naturally prioritize visible musculoskeletal fractures or overt neurotrauma during initial trauma resuscitation. Clinicians frequently discharge stable patients without realizing that diaphragmatic tears never heal spontaneously. Because continuous respiratory motions prevent fibrous union across the tear, the anatomical aperture progressively widens over time. Many patients forget remote vehicular accidents that occurred years prior to their respiratory presentation. Therefore, physicians must routinely take detailed trauma histories whenever they evaluate unexplained lower thoracic opacities.

Imaging Strategies: Beyond Conventional Chest Radiography

Standard chest radiographs offer limited diagnostic yield in delayed diaphragmatic herniation, demonstrating only nonspecific hemidiaphragm elevation or basal opacity. Contrast-enhanced computed tomography represents the frontline modality for evaluating complex thoracic pathology; however, identifying right-sided tears on axial slices remains challenging. The herniated liver tissue shares identical attenuation with intra-abdominal parenchyma, effectively concealing the ruptured diaphragmatic border. Furthermore, pleural effusion and compressive atelectasis obscure subtle structural transitions across the muscular boundary.

To overcome these diagnostic hurdles, multiplanar sagittal and coronal CT reformations provide indispensable anatomical visualization. Clinicians should specifically evaluate characteristic features, such as the collar sign, which denotes focal hepatic constriction at the defect. Moreover, dynamic imaging modalities deliver remarkable diagnostic clarity. Upper abdominal magnetic resonance imaging clearly delineates the continuous hepatic tissue traversing the diaphragmatic aperture. Similarly, diaphragmatic ultrasonography enables real-time evaluation of muscular excursion and liver border discontinuity. Combining these imaging tools prevents diagnostic errors and expedites surgical referral.

The Role of Biopsy and Risk of Misdiagnosis

When non-invasive staging fails to provide definitive answers, clinicians often resort to tissue biopsies to exclude malignancy. In the reported patient, positron emission tomography revealed no metabolic avidity, prompting a CT-guided percutaneous biopsy of the presumed thoracic tumor. Unexpectedly, pathological evaluation demonstrated normal hepatic architecture rather than neoplastic cells. This striking finding immediately shifted clinical focus toward diaphragmatic rupture.

However, performing percutaneous thoracic biopsies on unsuspected herniated viscera carries significant clinical danger. Inadvertent puncture of vascularized hepatic tissue, intrahepatic bile ducts, or translocated bowel can precipitate life-threatening hemothorax, biliary peritonitis, or organ perforation. Therefore, interventional radiologists and pulmonologists must rigorously scrutinize the inferior margin of any basal thoracic mass before introducing biopsy needles. Tracing hepatic vessels directly through the hemidiaphragm confirms visceral herniation, eliminating the need for hazardous percutaneous sampling. Thorough multiplanar image review protects patient safety and avoids unnecessary invasive diagnostics.

Surgical Considerations and Multidisciplinary Management

Definitive management of chronic diaphragmatic hernias demands surgical repair to avert visceral strangulation and restore respiratory mechanics. Unlike acute repairs, chronic cases present distinct technical hurdles due to dense fibrous adhesions between the herniated liver, pleura, and pericardium. Consequently, thoracic surgeons must determine whether a transthoracic, transabdominal, or combined thoracoabdominal approach is optimal. Right-sided chronic lesions typically favor thoracotomy or video-assisted thoracoscopic surgery, which allows safe adhesiolysis around the hepatic dome.

During surgery, teams gently reduce the herniated liver back into the peritoneal cavity and assess tissue viability. Because chronic muscular retraction often widens the defect, primary closure without tension may prove impossible. In such scenarios, surgeons successfully utilize prosthetic or biological mesh to achieve durable reconstruction. Multidisciplinary collaboration among pulmonologists, radiologists, and thoracic surgeons remains essential throughout the perioperative period. Ultimately, prompt identification and individualized surgical repair relieve chronic respiratory distress and deliver excellent long-term clinical outcomes.

Why is a right-sided diaphragmatic hernia often misdiagnosed as a thoracic tumor?

A right-sided diaphragmatic hernia frequently mimics a thoracic tumor because herniated hepatic parenchyma creates a large, uniform soft-tissue mass on conventional radiographs and axial CT scans. Furthermore, when patients present with chronic respiratory symptoms and a history of neoplasm, clinicians intuitively suspect malignant relapse. The homogeneous density of liver tissue and accompanying reactive pleural fluid obscure diaphragmatic boundaries, leading clinicians away from considering mechanical diaphragmatic disruption.

What imaging modality provides the highest sensitivity for delayed diaphragmatic hernia?

Multiplanar computed tomography with coronal and sagittal reformations serves as the primary diagnostic standard. These reconstructions clearly depict diaphragmatic discontinuity and pathognomonic features like the collar sign. Additionally, upper abdominal magnetic resonance imaging provides exceptional soft-tissue contrast, differentiating herniated hepatic parenchyma from pulmonary masses without radiation. Diaphragmatic ultrasonography further assists clinicians by assessing diaphragmatic movement dynamically and identifying parenchymal defect margins at bedside.

What surgical approach is preferred for repairing chronic right-sided diaphragmatic ruptures?

Surgeons generally favor a right transthoracic approach, such as thoracotomy or video-assisted thoracoscopic surgery, for delayed right-sided herniations. Dense fibrous adhesions typically form between the displaced liver and the thoracic wall over months or years, making transabdominal reduction dangerous and technically difficult. The transthoracic route affords superior visualization to dissect adhesions safely under direct vision, reduce the liver into the abdomen, and place prosthetic mesh when large defects preclude tension-free primary closure.

Disclaimer: This content is for informational and educational purposes only and should not be considered medical advice or relied upon for clinical decisions. Refer to the latest local and national guidelines for clinical practice.

References

Xia HY et al. [Right-sided delayed traumatic diaphragmatic hernia misdiagnosed as a thoracic mass: a case report]. Zhonghua Jie He He Hu Xi Za Zhi. 2026 Sep 12. doi: 10.3760/cma.j.cn112147-20260415-00214. PMID: 42706210.

Mishra P, et al. Massive right-sided diaphragmatic hernia with intrathoracic liver. BMJ Case Rep. 2026;19(8):e272361. doi: 10.1136/bcr-2026-272361.

Rashid F, Chakrabarty MM, Singh R, Iftikhar SY. A review on delayed presentation of diaphragmatic rupture. World J Emerg Surg. 2009;4:32. doi: 10.1186/1749-7922-4-32.

Leivaditis V, et al. Massive right intrathoracic liver herniation four years after traumatic diaphragmatic rupture. J Surg Case Rep. 2024;2024(5):rjae312. doi: 10.1093/jscr/rjae312.