Dual schwannomas of the ulnar nerve: the importance of surgical exploration beyond imaging: a case report

We present a compelling case of a 41-year-old woman who presented with paresthesia in the ulnar distribution and a palpable mass near the distal forearm. Examination showed a non-mobile, deep mass with a positive Tinel's sign. Preoperative magnetic resonance imaging identified a well-defined lesion suggestive of a nerve sheath tumour. Intraoperatively, a second mass in the Guyon canal was discovered. Exploration revealed a second, smaller lesion within the Guyon canal. Both schwannomas were excised, leading to full symptom resolution. This case highlights the importance of a comprehensive diagnostic approach to inform surgical decision-making and ensure optimal patient outcomes.