👉 Leptorrhynchi, also known as leptomeningeal neoplasms or leptomeningiomas, are benign tumors that develop in the meninges (the membranes surrounding the brain and spinal cord) of the brain. These tumors occur primarily in adults but can also be seen in children with certain risk factors such as smoking, alcohol use, obesity, and diabetes. Leptorrhynchi typically appear as a small, round mass or cystic lesion in the meninges that