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The micropapillary pattern in lung adenocarcinoma includes a variety of appearances, ranging from the classic form in which tumor cells lacking fibrovascular cores are arranged in papillary tufts, florets, and intraalveolar clusters (A) to the filigree form with its delicate lacelike narrow stacks of tumor cells (B) and the stromal form featuring infiltrating clusters of tumor cells within cleft-like spaces surrounded by stroma (not shown) (HE stain, ×400).
