Cocaine abuse induced diffuse alveolar haemorrhage: a rare entity.

Diffuse alveolar haemorrhage (DAH) is characterised by diffuse pulmonary opacities, respiratory failure, a falling haemoglobin level along with presence of hemosiderin-laden macrophages on bronchoalveolar lavage (BAL). Finding the underlying aetiology of DAH can be challenging but of importance as the treatment and prognosis are largely determined by it. We report a case of DAH with underlying cocaine abuse, a rare cause for the same.