Aneurysmal bone cyst (ABC), a tumor-like destructive lesion, is characterized by the presence of cavities of different sizes, which are filled with blood, connective tissue-septated with fibroblasts, histiocytes, osteoclast multinucleated giant cells, osteoids, bone trabecules, and accompanied by high intraosseous pressure. ABC most frequently occurs in the second decade of life. ABC is located in the metaphyseal area in children, by displacing to the diaphysis during their growth. Surgery is a basic treatment for ABC. Its relapses frequently occur, which depends on the method of a surgical intervention, methodic activity, and the belonging to a risk group (including a combination of age, cyst size, process phase, and location).