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(A) Low-grade non-intestinal adenocarcinoma. A complex papillary growth pattern with tubular and glandular structures. A single layer of bland columnar cells line the papillae. H-E stain x160. (B) Another low-grade non-intestinal adenocarcinoma. A single layer of bland columnar cells line the papillae. No nuclear pleomorphism or mitoses are seen in papillae or tubules. H-E stain x400
