A benign or malignant neoplasm that affects the wall of the jejunum. Representative examples include adenoma, carcinoma, and lymphoma. The disease is MONDO_0002564 (jejunal neoplasm). Also known as: jejunal tumor, jejunal tumour, jejunum neoplasm, jejunum neoplasm (disease), jejunum tumor, jejunum tumour, neoplasm of jejunum, neoplasm of the jejunum.