Abstract
Schwannomas are uncommon, mostly benign nerve sheath tumors that typically present as painless or intermittently painful lumps. They are most commonly found on the flexor surfaces of the body, with occurrence in the radial nerve being exceptionally rare. We present the case of a 55-year-old male with a five-month history of a progressively enlarging, mobile mass on the posterior aspect of the right arm. The patient presented with a transient, "shock-like pain" that failed to respond to conservative management. Imaging confirmed a peripheral nerve schwannoma located deep in the triceps posterior fascia along the lateral head of the triceps within the radial nerve. Due to persistent symptoms and failure of conservative treatment, surgical excision of the neural tumor was recommended. This case highlights the clinical presentation and surgical management of a rare radial nerve schwannoma.