Interstitial lung disease and pre-capillary pulmonary hypertension in neurofibromatosis type 1.

Although previously reported, the existence of a neurofibromatosis (NF)-associated diffuse lung disease (DLD) still lacks solid evidence. We report a case of a 68-year-old non-smoking female with NF1, pre-capillary pulmonary hypertension (PH) and an interstitial lung pattern. Initial findings included progressive dyspnea, hypoxemia and sparse centrilobular ground-glass micronodules on high-resolution computed tomography (HRCT). Further study demonstrated a severe defect in diffusing capacity for carbon monoxide (DLCO), macrophages on bronchoalveolar lavage and pre-capillary PH on right cardiac catheterization. Surgical biopsy revealed macrophage accumulation along bronchovascular bundles and alveolar spaces and type II pneumocytes hyperplasia. Given the absence of environmental exposure or new drugs, a NF-DLD was hypothesized. Pre-capillary PH was disproportionate to interstitial findings, so it was attributed to a NF1-vasculopathy. Treatment with triple sequential combined therapy was unsuccessful culminating in death 18 months later. This case adds HRCT and anatomopathological data suggesting NF-DLD as a distinct manifestation of the disease.