Diagnostic Approach and Management of Elevated Right Hemidiaphragm

Initial Diagnostic Steps

Chest X-ray is the recommended first diagnostic study to identify the elevated hemidiaphragm, though it has limitations in determining the underlying cause 1
Suspicious chest X-ray findings include abnormal lucency, soft tissue opacity with mediastinal deviation, or hemidiaphragm elevation 2
CT scan of chest and abdomen is the gold standard for diagnosis with sensitivity and specificity of 14-82% and 87%, respectively 1
CT findings may include: diaphragmatic discontinuity, segmental non-recognition of the diaphragm, "dangling diaphragm" sign, "dependent viscera" sign, elevated abdominal organs, and thickened diaphragm 2

Diaphragmatic hernia (traumatic or non-traumatic) can cause an elevated right hemidiaphragm 1
Subdiaphragmatic pathology pushing the diaphragm upward can also cause an elevated right hemidiaphragm 3

Ultrasonography may be useful, especially in pregnant patients with suspected non-traumatic diaphragmatic hernia 1
MRI can provide additional information in cases where CT findings are inconclusive 1

Surgery is the treatment of choice for symptomatic diaphragmatic hernia 4
In stable patients with traumatic diaphragmatic hernia, laparoscopic approach is strongly recommended (1B evidence) 4
In unstable patients, laparotomy approach is suggested (2C evidence) 4
Primary repair with non-absorbable sutures should be attempted when possible 5
For larger defects (>3 cm), mesh reinforcement is suggested to prevent recurrence (2C evidence) 4
Biosynthetic, biologic or composite meshes are preferred due to lower recurrence rates and higher resistance to infections (2C evidence) 4

When evaluating chest radiographs, be cautious about misinterpreting subpleural fat as pleural thickening, which can be differentiated by HRCT 6

Avoid misdiagnosing diaphragmatic hernia as simple elevation; look for specific signs on imaging such as the "collar sign" (constriction of herniating organ at the rupture level) 1
Don't overlook the possibility of malignancy as a cause of diaphragmatic elevation, especially in patients with risk factors for lung cancer 3
Be aware that normal chest radiographs have been reported in 11-62% of cases with diaphragmatic injuries or uncomplicated diaphragmatic hernias 2

The American College of Chest Physicians suggests that phrenic nerve injury from prior procedures, such as chest tube insertion or cardiac surgery, can cause diaphragmatic paralysis, with a study published in Chest in 2013 7
Lung cancer with mediastinal invasion can cause phrenic nerve dysfunction, according to a study published in Chest in 2013, highlighting the importance of considering malignancy in the differential diagnosis 7
Pulmonary embolism can present with elevated hemidiaphragm, as seen in 36% of PE cases vs 25% without PE, although this is a nonspecific finding, as reported in the European Heart Journal in 2000 8

No directly cited management guidelines are available in the provided text, however, the importance of considering the etiology and diagnosis in guiding management decisions is emphasized by the cited facts above 7, 8