{Reference Type}: Case Reports {Title}: Lady Windermere Syndrome: Unravelling an Older Lady's Nightmare. {Author}: Parvathaneni A;Malempati SC; {Journal}: Cureus {Volume}: 15 {Issue}: 10 {Year}: 2023 Oct 暂无{DOI}: 10.7759/cureus.47601 {Abstract}: Infection with nontuberculous mycobacteria (NTM) is an increasingly important cause of pulmonary disease, particularly in immunocompromised patients or those suffering from chronic lung conditions. However, though rare, non-tubercular mycobacterial infection and bronchiectasis may also occur in an immunocompetent patient. This unusual condition is typically seen in middle-aged or elderly white females, with bronchiectasis having a predilection for the middle lobe and lingula. Here, we present a similar case of Mycobacterium avium complex (MAC) infection with middle lobe bronchiectasis in an elderly immunocompetent female, recognized as Lady Windermere Syndrome (LWS).