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多型性腺瘤是常见的口腔唾液腺瘤。发生于硬腭和软腭的肿瘤中有50%以上属于多型性腺瘤。其组织学特征属于良性,但肿瘤无完整的被膜,瘤组织突出于包膜外生长,这种生长特点很可能与复发率高有关(5～50%)。而复发率与手术方法有密切关系。Pogrel 报道总复发率为18%,采用局灶切除术或刮除术其复发率上升到30%,而作扩大切除则复发率可下降到零。肿瘤的复发一般为多个子瘤,治疗困难,因此首次切除应包括覆盖粘膜、被膜、以及其基底部骨膜,如果怀疑有骨组织受累还需进行骨切除术。如肿瘤较大且达软腭则手术难度较大。
Polymorphic adenomas are common oral salivary adenomas. More than 50% of tumors that occur in hard palate and soft palate are polymorphic adenomas. Its histological characteristics are benign, but the tumor does not have a complete capsule, and the tumor tissue protrudes out of the capsule. This growth characteristic is probably related to a high recurrence rate (5 to 50%). The recurrence rate is closely related to the surgical method. Pogrel reported a total recurrence rate of 18%. The recurrence rate was increased to 30% with focal resection or curettage, and the recurrence rate was reduced to zero with extended resection. The recurrence of tumors is usually multiple tumors and is difficult to treat. Therefore, the first resection should cover the mucosa, the capsule, and its basement periosteum. If bone tissue involvement is suspected, bone resection is required. If the tumor is large and soft, the operation is difficult.