"Adenocarcinomas in situ (AIS) of the lung refer to a relatively new entity which falls under the spectrum of pre-invasive lesions of the lungs. This entity partly replaces the noninvasive end of the previous term bronchoalveolar carcinoma. Adenocarcinoma in situ is defined as a localised adenocarcinoma of"
Expected headings
"FDG PET-CT"
"AISs are localised adenocarcinomas of ≤3 cm, with no growth pattern other than lepidic, with neoplastic cells along the alveolar structures but without stromal, vascular, lymphatic, or pleural invasion, and no features of necrosis 6."
"There are three histopathological subtypes, the most common is non-mucinous, with mucinous or mixed subtypes being rarely found."