Gastrointestinal hemorrhage due to ileal metastasis from primary lung cancer

Figure 1 Abdominal computed tomography scan revealed metastatic tumor mass of ileum (solid arrow) and the enlarged lymph node (dotted arrow).

Figure 2 Intraoperative imaging of the resected tumor of the ileum. The tumor was 4.5 cm × 3.0 cm in size, with a clear margin and ulceration on the intraluminal surface.

Figure 3 Microscopic findings of metastatic lung squamous cell carcinoma in the ileum.

Figure 4 By immunohistochemistry, the tumor cells were found to be positive for CKH (A) and P63 (B), but negative for CK20 (C) and CK7 (D).