Schwannomas of the upper limb: Clinical presentation, preoperative management and outcomes of surgical treatment

Inroduction: Schwannomas are the most common tumors of the peripheral nervous system. Surgical eradication with excision or enucleation is the treatment for symptomatic and large schwannomas. Aim: Few studies have investigated the clinical outcomes related to the surgical approach to schwannomas. Our study aims to evaluate the clinical and functional results of surgery for the treatment of upper limb schwannomas. Materials and methods: Twenty-two cases of upper limb schwannomas were surgically treated in our institution between January 2016 and December 2023. All cases underwent preoperative and 6-month postoperative MRI. For each case, we recorded the diagnostic interval (symptom-diagnosis), symptoms (stenosis or sensory deficits, pain, and Tinel test), and both pre-and postoperative functional status (with DASH and MSTS scores). We also recorded complications and local recurrences. Results: On average, the diagnosis was made 16.7 months after the onset of the first symptom. The mean preoperative MSTS, DASH, and MRC values were 27.9, 5.7, and 4.8, respectively. We had no intra-operative complications. After a mean follow-up of 43.1 months, MSTS, DASH were 29.7/30 and 0.7, respectively. No case developed local recurrences. No case recorded stenosis deficits at the last follow-up. Only one patient developed local paresthesia (9%), while two reported modest dysesthesias. Conclusions: An adequate surgical approach, possibly preceded by a rapid diagnosis, can significantly improve the symptoms caused by schwannoma, restoring the functionality of the upper limb.