Official Publication of the National Center for Trauma Research Trauma Monthly 2251-7464 24 3 2019 05 01 Progressive Radial Nerve Entrapment Resulted in Finger Drop: A Case Report 1 4 101991 10.5812/traumamon.85461 EN Mohammadreza Emamhadi Brachial Plexus and Peripheral Nerve Injury Center, Guilan University of Medical Sciences, Rasht, Iran Roxana Emamhadi Department of Biotechnology, School of Basic Sciences, Tonekabon Branch, Islamic Azad University, Tonekabon, Iran Sasan Andalib Neuroscience Research Center, Poursina Hospital, Guilan University of Medical Sciences, Rasht, Iran 0000-0003-0904-0925 Journal Article 2020 01 23 Introduction: Posterior interosseous nerve (PIN) palsy gives rise to various symptoms. The PIN due to lipoma is rare. Here, we report a case of progressive loss of finger extension due to a giant painless parosteal lipoma. Case Presentation: A 52-year-old patient with progressive weakness of finger extension with diagnosis of posterior interosseous nerve (PIN) palsy was referred to our clinic. Electrophysiological studies showed a right PIN neuropathy at the level of the forearm. The patient had no history of trauma of the hand. The patient underwent surgery for tumor removal and nerve decompression. The loss of finger extension due to PIN palsy gradually recovered after tumor removal and the nerve recovered from the motor deficits. The patient showed no recurrence of motor deficit after the surgery in the follow-up. Conclusions: Since PIN palsy may arise from lipoma early surgical exploration and the excision of deep-seated lipoma in the proximal forearm is recommended in order to avoid permanent damage to PIN or other branches of the radial nerve.

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