{Reference Type}: Journal Article
{Title}: Updated Imaging Classification of Hypersensitivity Pneumonitis.
{Author}: Chelala L;Adegunsoye A;Cody BA;Husain AN;Chung JH;
{Journal}: Radiol Clin North Am
{Volume}: 60
{Issue}: 6
{Year}: Nov 2022
{Factor}: 1.947
{DOI}: 10.1016/j.rcl.2022.06.013
{Abstract}: Hypersensitivity pneumonia (HP) refers to a heterogeneous group of interstitial lung diseases resulting from a non-IgE immune-mediated reaction to inhaled pathogens in susceptible and sensitized hosts. Environmental and genetic factors are important substrates of disease pathogenesis. A recurrent or ongoing airborne exposure results in activation of humoral and cellular immune responses. This article discusses key clinical, radiologic, and histopathologic features of HP and reviews current recommendations.