RESUMEN
Anaplastic large-cell lymphoma (ALCL) is an aggressive subtype of non-Hodgkin lymphoma. There are two forms of ALCL: primary and secondary. Primary can be systemic, affecting multiple organs, or cutaneous, affecting mainly the skin. A secondary form occurs when another lymphoma undergoes an anaplastic transformation. ALCL rarely presents as initial symptoms of respiratory failure. In most of these situations, the trachea or bronchial involved with an obstruction was present. We present an unusual case of ALCL where the patient rapidly progressed to acute hypoxic respiratory failure with a patent bronchus and trachea. Unfortunately, the patient rapidly deteriorated and died before diagnosis. Only upon at autopsy, it was found that his lung parenchyma was diffusely involved with ALCL. The autopsy report showed that the patient had CD-30 anaplastic lymphoma kinase (ALK)-negative ALCL diffusely involving all lung fields.