Rectal metastasis from lung cancer diagnosed by endoscopic ultrasound‐guided fine needle biopsy: A case report

• DOI: 10.1002/deo2.70127
• Publication Date: 2025-04-29T07:30:54Z
• Authors: Shinji Mukawa; Yudai Koya; Tomoyuki Murakami; Koichiro Miyagawa; Yuki Maruno; Koki Yamaguchi; Shun Hanada; Shinji Oe; Masaru Harada
• Keywords: Endoscopic Ultrasound

A 73-year-old man visited our hospital due to hyperintestinal peristalsis and diarrhea. He had been undergoing regular annual checkups for dust lung disease. Contrast-enhanced computed tomography scan showed edematous thickening of the rectal wall with contrast effect. colonoscopy revealed a submucosal tumor-like protrusion in Rb lesion rectum without neoplastic epithelial changes. Forceps biopsies overlying mucosa were non-diagnostic; however, endoscopic ultrasound-guided fine needle biopsy that specimen was poorly differentiated non-small cell invasive carcinoma. Then, we performed chest newly detected mass upper lobe right lung. Based on immunohistochemical analysis image findings, patient diagnosed metastasis from cancer. Subsequently, sputum cytology confirmed diagnosis adenocarcinoma. Rectal protrusions are occasionally encountered. When non-exposed tumor is identified, it important differentiate metastatic diseases, consider biopsy, make definitive through detailed evaluation systemic imaging surveillance.