Definition: Adenocyst is a cyst formed by adenoid tissue, which are mainly benign but sometimes malignant (adenovirus or viral infections). These cysts grow in the cavities between the two middle teeth, usually on the left side. They are generally harmless and do not need treatment. However, they can become infected if they do not get treated properly, and some adenoids may develop into cancerous tumors. The most common adenoid cyst is usually the lower right one in your upper jaw. Other cases of adenoid cysts include the third molar tooth, the molars on the back side (frontal) of the tongue, and the upper incisors (upper teeth), among others. If you notice a lesion that resembles an adenoid, it should be treated immediately as it could lead to serious complications like infection or cancer. Adenocysts are usually small in size but may get bigger over time if they do not receive proper treatment. They can also develop into larger cysts when left untreated for too long. To diagnose a benign adenoid cyst, you will need to see a dentist and undergo an examination of the teeth and jaws. Treatment options include: - Infection: Antibiotics or surgery may be necessary. - Cancer: This requires surgery (usually under local anesthesia) and radiation therapy if it is located in the neck. Please note that this information is not meant as medical advice, but rather a description of common adenoid cysts. If you have any concerns about your dental health, please consult a dentist or healthcare professional for proper diagnosis and treatment.