A modified method for minimizing damage to the marginal mandibular branch (MMB) during partial superficial parotidectomy(PSP): A retrospective study.

The aim of this study was to compare modified partial superficial parotidectomy (MPSP) with conventional partial superficial parotidectomy (CPSP) in a retrograde approach, and to determine whether MPSP can reduce the risk of injury to the MMB of the facial nerve and the rate of postoperative facial palsy. Patients with benign parotid gland tumors of the superficial lobe were included retrospectively in two groups: one group was treated with CPSP; the other group was treated with MPSP, in which the MMB was dissected in an anterograde direction or not dissected. The patients' sex and age, location of tumor, size of tumor (maximum tumor diameter), histopathological distribution, operative time, and incidence of postoperative facial nerve weakness were compared. There was no significant difference in operative time between the two groups (p = 0.913). There was a significant difference (p = 0.008) in postoperative facial nerve weakness, with temporary facial nerve weakness observed in 19 and five patients in the CPSP and MPSP groups, respectively. Furthermore, there was a significant difference (p = 0.009) in MMB weakness, with temporary MMB weakness observed in 15 and three patients in the CPSP and MPSP groups, respectively. There was no significant difference (p = 0.564) in the weakness of other branches between the two groups. All cases of paresis scored ≤3 on the House-Brackmann scale, and all cases of temporary facial nerve weakness resolved within 6 months of surgery. No patient developed permanent paralysis. Within the limitations of the study, it seems that modified partial superficial parotidectomy (MPSP) should be preferred over conventional partial superficial parotidectomy (CPSP) whenever appropriate.