Marijuana induced spontaneous pneumomediastinum.

Spontaneous pneumomediastinum (SPM), a rare occurrence, is defined by the presence of extraluminal gas in the mediastinum in the absence of trauma or underlying parenchymal disease. It is usually benign and has been associated with the inhalation of marijuana, cocaine, and amphetamines. The breathing maneuvers along with cyclical vomiting have been postulated as the underlying etiology.

Dyspnoea with progressive "idiopathic" pulmonary fibrosis.

Telomeres are repetitive nucleotide sequences that prevent chromosomal shortening in cell replication. Short telomeres have been implicated in the pathogenesis of interstitial lung disease. Patients with short telomere related pulmonary fibrosis can have computed tomography (CT) findings inconsistent with pro-typical usual interstitial pneumonia/idiopathic pulmonary fibrosis (UIP/IPF) pattern.