Cases of carpal tunnel syndrome (CTS) secondary to ganglion cysts are sparse in the literature. The purpose of this case report is to demonstrate clinical and magnetic resonance imaging (MRI) findings of CTS secondary to an intra-tunnel ganglion, with denervation of the abductor pollicis brevis muscle (APB). A 42-year-old female presented with worsening pain, numbness, and tingling in the right hand of several months duration. Median sensory and motor latencies were consistent with CTS. MRI revealed a cystic mass within the carpal tunnel, which displaced and compressed the median nerve. Additionally, homogenous high signal intensity within the APB was detected, consistent with acute denervation. The diagnosis of CTS secondary to ganglion cyst was confirmed intraoperatively, with median nerve decompression and cyst removal.

中文翻译：

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神经节囊肿继发的腕管综合症，伴有外展肌短肌畸形

在文献中，继发于神经节囊肿的腕管综合症（CTS）病例很少。本病例报告的目的是证明在隧道内神经节继发的CTS的临床和磁共振成像（MRI）发现，以及外展短脊肌短肌（APB）的失神经。一名42岁的女性在持续数月的右手中出现疼痛加剧，麻木和刺痛感。中位感觉和运动潜伏期与CTS一致。MRI显示腕管内有囊性肿块，移位并压缩了正中神经。另外，在APB内检测到均一的高信号强度，这与急性去神经支配相一致。术中证实神经节囊肿继发CTS，正中神经减压和囊肿切除。