The clinico-statistical observation on benign tumors in our department for past 10 years (1976-1985)

We have attempted clinico-statistical observation on 415 cases of benign tumors during past 10 years period from 1976 to 1985. Results obtained were as follows:1) The 415 cases consisted of three groups, 59 odontogenic tumors, 302 non-odontogenic tumors and 54 salivary gland tumors (1.1:5.6:1). There were 161 males and 254 females, a 1:1.6 sex ratio.2) Histopathologically, 28 cases (47.5%) of odontogenic tumors were diagnosed as ameloblastoma, 106 cases (35.1%) of non-odontogenic tumors as hemangioma and 42 cases (97.8%) of salivary gland tumors as pleomorphic adenoma.3) The age at onset of symptoms revealed a perdilection for second and fourth decades (mean age: 34.3 years) as whole, and as to each group, odontogenic tumors for second and third decades (mean age: 24.7 years), non-odontogenic tumors for second and fifth decades (mean age: 34.6 years) and salivary gland tumors for under second and sixth decades (mean age: 43.0 years).4) The age at first visit revealed a perdilection for fourth and fifth decades (mean age: 38.0 years) as a whole, and as to each group, odontogenic tumors for second and third decades (mean age: 28.9 years), non-odontogenic tumors for fourth and fifth decades (mean age: 38.4 years) and salivary gland tumors for sixth and over eighth decades (mean age: 46.6 years).5) The duration of symptoms ranged from 1 to 3 years as a whole, and as to each group, under 1 month in odontogenic tumors, from 1 to 3 years in non-odotogenic tumors and also in salivary gland tumors.6) The chief complaints were swelling in 320 cases (82.3%), pain in 33 cases (8.5%) and further exact examination in 20 cases (5.1%).7) As a whole, the prevalent locations were the tongue (28.6%), followed by the mandible (13.2%) and the lips (11.6%), Odontogenic tumors occured only in the maxilla and the mandible, non-odontogenic tumors in the tongue, the lips and the buccal mucosa and salivary gland tumors in the palate and the parotid regions.8) Of the removed 286 tumors, 72 tumors (26.9%) were sized between 10 and 20mm, 66 tumors (24.6%) between 5 and 10mm and 64 tumors (23.9%) between 20 and 40mm.9) The most common treatment in this series was surgical excision except for fenestration (7 cases) and mandibulectomy or maxilloectomy (5 cases) of ameloblastoma.