Persistent diffuse pulmonary interstitial emphysema mimicking pulmonary emphysema

Pulmonary interstitial emphysema in fatal asthma: case report and histopathological review

BACKGROUND

Mortality related to asthma has decreased worldwide since the introduction of inhaled corticosteroid therapy in the past decades. However, there are still some asthma fatalities identified mainly in populations with less access to regular treatment. Pulmonary interstitial emphysema due to alveolar rupture has been rarely described as a complication of an acute severe asthma attack, and its identification in pathological analysis can be difficult. Previous studies reported the association of pulmonary interstitial emphysema and bronchial ductal gland ectasia in asthma.

CASE PRESENTATION

We present the case of a 42-year- old man that died due to a fatal asthma attack. Postmortem computed tomography revealed the unusual finding of acute Pulmonary Interstitial Emphysema, confirmed by pathological analysis. We reviewed 28 cases of fatal asthma tissue and identified the presence of pulmonary interstitial emphysema in 10% of the cases.

CONCLUSIONS

Postmortem computed tomography is a useful complimentary diagnostic tool for autopsies. Pulmonary Interstitial Emphysema in acute exacerbations of asthma seems to be more frequent than reported. Alveolar hyperdistension and bronchial duct gland ectasia causing tissue rupture are possible mechanisms involved in the formation of Pulmonary Interstitial Emphysema. The clinical impact of Pulmonary Interstitial Emphysema in asthma is unknown.

Pulmonary interstitial emphysema in an adult with metastatic choriocarcinoma

Although typically seen in neonates, barotrauma is a well-established complication of mechanical ventilation in other populations as well, particularly associated with the use of high peak pressures and continuous positive airway pressure. Complications range from subpleural bleb development to life-threatening pneumothorax. We report a case of barotrauma in an adult that initially presented as pulmonary interstitial emphysema; it was seen surrounding choriocarcinoma metastases during computed tomography evaluation for worsening respiratory distress.