Recently, two patients came to our hospital with a chief complaint of indolent swelling of one sided submandibular gland. Clinical symptoms and examination results suggest that both patients probably had chronic sclerosing sialadenitis (Küttner's tumor).Case 1 (A 44-year-old male): This patient came to our hospital on January 18, 1986 with a chief complaint of indolent swelling of the left submandibular area. His face was asymmetrical and a poorly-demarcated, diffuse swelling was noted in the area from the left mandibula to the mentum. The swelling was elastic and hard; no fluctuation was palpable. Based on the results of various examinations, the patient was diagnosed as having chronic left sialadenitis. On February 12, 1986 the patient underwent complete excision of the submandibular gland under general anesthesia.Case 2 (A 44-year-old male): This patient came to our hospital on August 6, 1986 with chief complaints of indolent swelling of the right submandibular area and of trismus. His face was asymmetrical, and a poorly-demarcated, diffuse swelling was noted in the angle of the right jaw. The swollen area was elastic hard without fluctuation was palpable in it. In addition, the patient complained of severe salivary colic. Based on the results of various examination, this patients was diagnosed as having chronic right sialadenitis. On August, 13, 1986, the patient underwent complete excision of the right submandibular gland under general anesthesia.Postoperative histologic examination suggested that both of these two cases had chronic sclerosing sialadenitis (Kuttner's tumor). Their postoperative course was uneventful.