BAC pattern

(redirected from bronchioloalveolar carcinoma pattern)

BAC pattern

Bronchioloalveolar carcinoma pattern. A term of art referring to a so-called lepidic (hobnail-like cells spreading across a surface) growth pattern of a tumour that mimics classic bronchioloalveolar carcinoma.
References in periodicals archive ?
Of the 187 adenocarcinomas, 45 (24%) cases were classified as adenocarcinoma with bronchioloalveolar carcinoma pattern (26 women and 19 men).
In 45 cases of adenocarcinoma with bronchioloalveolar carcinoma pattern, the MUC4 immunoreactivity was seen both in mucinous (Figure 2, D) and nonmucinous cells (Figure 2, E).