Minimally invasive adenocarcinoma of the lung (MIA) is defined as a small (≤3 cm), solitary tumour with predominant alveolar epithelial appearance (lepidic growth), as in situ adenocarcinoma of the lung, with a zone of focal invasion of the chorion, with a size inferior to 5 mm. For MIA—as with adenocarcinoma in situ—, the prognosis is near 100% survival.