RESUMEN
We report a clinical case of a 39-year old male, without any known previous medical condition but with occupational exposure to paints and dust cement, who presented an autoimmune pulmonary alveolar proteinosis (PAP) triggered by exposure to toxic inhalation at his workplace. PAP is a rare lung disease characterized by intra-alveolar abnormal accumulation of surfactant. The presence of a crazy-paving pattern in high-resolution computed tomography scan brings the suspicion of PAP although histopathology results of bronchoalveolar lavage are always required for its final diagnosis. The autoimmune form of PAP due to toxic inhalation, such as the one here described, is rare and it is usually difficult to establish a causal relationship.
RESUMEN
Oxaliplatin-based chemotherapy has been widely used to treat colorectal cancer. Here, we report a case of a 71-year-old man, former smoker (40 pack-years), with no history of relevant exposures such as occupational, environmental or drug exposure. The patient developed acute partial respiratory insufficiency concomitant with the eighth cycle of adjuvant chemotherapy with oxaliplatin and capecitabine for stage IIIA colorectal adenocarcinoma. After the exclusion of other causes, namely pulmonary thromboembolism, high-resolution chest computed tomography (CT) showed a usual interstitial pneumonia (UIP) pattern. After the discussion at the multidisciplinary meeting on interstitial lung diseases and considering the temporal association between clinical and imaging findings and chemotherapy treatment, along with exclusion of other potential causes, the most likely hypothesis was pulmonary fibrosis secondary to oxaliplatin. A literature review on this scope was also performed. We conclude that pulmonary fibrosis is a rare complication of oxaliplatin, but with the widespread use of oxaliplatin combinations in colorectal cancer, active assessment for interstitial lung disease is recommended.