It was evaluated the frequency of focal nodular liver hyperplasia and treatment resultsin 1425 patients for the last 17 years in 2 time period. The own experience and literature data were used. First this disease was considered as very rare liver tumor because of underdeveloped diagnostics. Tumor detection was the indication for laparotomy. In some patients removal of the tumor was not performed if intraoperativebiopsy has shown tumor benign. The indication for dynamic observation and surgical treatment were identified with increasing number of patients, diagnostics improvement, and analysis of immediate and long-term results. The operation provides persistentcure.