Spontaneous pneumomediastinum, pneumopericardium and subcutaneous emphysema in a case of interstitial pneumonia with autoimmune features.

Spontaneous Pneumomediastinum (SPM) is a benign, self-limiting but potentially fatal condition specially in underlying pulmonary disease. Spontaneous pneumomediastinum is rarely associated with connective tissue related interstitial lung disease. We report a patient of interstitial pneumonia with autoimmune features who presented with acute onset breathlessness and was diagnosed to have spontaneous pneumomediastinum, pneumopericardium, and subcutaneous emphysema. This condition are easily diagnosed by clinical findings like Hamman's crunch and plain chest radiographs in cases with normal underlying lungs. In cases of extensive pulmonary fibrosis like Interstitial Lung Diseases both clinical findings and Plain chest radiographs can be inconclusive. CT of thorax is the gold standard diagnostic modality. Pneumopericardium rarely leads to cardiac tamponade, which requires immediate surgical intervention. We conclude that every case of acute onset breathlessness in a known case of interstitial lung disease may not necessarily be an exacerbation of the underlying lung condition. Physicians need to have a high index of suspicion while treating patients of interstitial lung disease. CT thorax is gold standard diagnostic modality especially in presence of fibrotic lung diseases.