The name mediastinum is relatively new to most readers; it is not an organ, but an anatomical region. There are many tissues and organs in the mediastinum, and thus a wide variety of tumors can occur, even if they are small, causing circulatory, respiratory, digestive, and neurological dysfunction. The incidence of mediastinal tumors in children is lower than that in adults, but the chance of cancer is higher. About 2/3 of children have early symptoms such as cough, low fever and difficulty in whistling, which are related to the small volume of chest cavity in children. Some children are occasionally found during chest X-ray, and if they have malignant tumors, they have anemia and wasting. Doctors can determine the location and size of the tumor by chest X-ray and the nature of the tumor by ultrasonic examination. Symptoms of mediastinal tumor Most benign mediastinal tumors are often asymptomatic clinically and are mostly found during physical examination. The common symptoms of malignant mediastinal tumor are: 1. chest tightness and chest pain are the most common symptoms of various mediastinal tumors, if the pain is severe and unbearable to the patient, most of them are malignant tumors. 2. When tumor compresses or invades lung and bronchus, it often causes coughing and shortness of breath, and when it is serious, whistling difficulty occurs. Tumor ulceration will produce pulmonary atelectasis and intrapulmonary infection. 3.Neurological symptoms, sympathetic nerve compression can be manifested as eyelid drooping, pupil shrinkage, eye entropion, etc.; laryngeal nerve compression can be manifested as hoarseness; involvement of phrenic nerve can cause eruption and paralysis at all levels. 4.Cardiovascular symptoms, cardiac panic, arrhythmia, facial and neck edema. 5.Difficulty in swallowing, caused by tumor compression or invasion of esophagus.