A neuroendocrine neoplasm (NEN) is a type of tumor that arises from neuroendocrine cells, which are specialized cells that produce hormones and neurotransmitters. These tumors can occur in various organs, including the lungs, pancreas, and gastrointestinal tract. NENs can be classified as either benign or malignant, depending on their growth behavior and potential to spread. Symptoms of neuroendocrine neoplasms vary widely and may include hormonal imbalances, abdominal pain, or changes in bowel habits. Diagnosis typically involves imaging studies, blood tests, and sometimes biopsy. Treatment options may include surgery, chemotherapy, or targeted therapies, depending on the tumor's type and stage.