View source for 51. Lepidic adenocarcinoma

[[File:Lepidic adenocarcinoma lung overview.png|thumb|Overview of the slide|408x408px]]'''Staining''': HE '''Organ''': Lung

'''Description''': The slide has two zones. The lower zone shows healthy, unaffected lung parenchyme. The upper zone shows normal structure of the alveoli, however the insides of the alveoli are lined by tumor cells.

'''Diagnosis''': Lepidic adenocarcinoma

'''Risk factors:''' Asian ethnicity, smoking Genetic mutations

'''Theory''':

Five types of lung adenocarcinomas exist: Papillary type, acinar type, solid type, micropapillary type (worse prognosis), and lepidic type (best prognosis).

This histology slide shows a “lepidic” growth pattern, which is the pattern where the tumor cells ''line'' the alveolar walls instead of invading the interstitium. The alveolar structure is therefore maintained. It’s technically an adenocarcinoma ''in situ'' because it hasn’t passed the basement membrane yet. Like other lung adenocarcinoma it's associated with mutations in EGFR, KRAS, ALK, PDL-1.[[File:Lepidic adenocarcinoma lung pleomorphism.png|thumb|Check out the pleomorphism of the tumor cells (anisochromasia, anisocytosis, anisonucleosis). Note that the tumor cells have large, pale cytoplasm. They belong to an ''adeno''carcinoma after all!|left]][[File:Lepidic adenocarcinoma lung lepidic growth pattern.png|thumb|The lepidic growth pattern. See how the cancer cell create a lining of the walls of the alveoli.|287x287px]]
[[Category:Pathology 1 - Histopathology slides]]