Invasive mucinous adenocarcinoma (IMA) is a distinct subtype of lung adenocarcinoma characterized by the production of mucin and a relatively poor prognosis. We present a case of a 42-year-old female presented with an infected bulla in the right upper lobe, which later turned out to be IMA. The diagnosis can be challenging, particularly when presenting as an infected bulla, a rare and unusual manifestation. Bullae are air-filled spaces within the lung parenchyma that can become infected, mimicking infectious processes. This case underscores the importance of considering malignancy in patients with chronic pulmonary infections.
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