• Jongpil Eun and Youngmin Oh.
• Department of Neurosurgery, Biomedical Research Institute, Jeonbuk National University Medical School and Hospital, Jeonju, South Korea.
• Medicine (Baltimore). 2021 Apr 23; 100 (16): e25587e25587.

RationaleTarlov or perineurial cysts are nerve root lesions often found in the sacral region. Most perineural cysts (PCs) remain asymptomatic throughout a patient's life. While their pathogenesis is still unclear, trauma resulting in hemorrhaging into subarachnoid space has been put forward as a possible cause of these cysts. Recently, we worked with a patient experiencing symptomatic PCs after spontaneous subarachnoid hemorrhage.Patient ConcernsA 45-year-old man had a coil embolization procedure performed after being diagnosed with a subarachnoid hemorrhage from a ruptured anterior communicating artery. His symptoms were relieved after the procedure, but 7 days later he reported worsening pain in the left perineal area. The pain was intermittent at its onset and exacerbated by sitting, walking, and coughing.DiagnosesTwo weeks after the embolization procedure, a lumbar spine MRI revealed 2 PCs at the S1 and S2 level affecting the left S2 root with high signal intensity in T2 and T1 images, suggestive of bleeding within the cyst.InterventionsWe operated using a posterior approach. Cyst fenestration was done after S1 laminectomy. We aspirated approximately 1 cc of old blood.OutcomesHis pain was relieved immediately after cyst removal and no neurologic deterioration occurred during the postoperative period.LessonsSubarachnoid hemorrhage can be the source of the development of pain from asymptomatic PCs, making them symptomatic. Surgical extirpation is 1 treatment option for these symptomatic PCs.Copyright © 2021 the Author(s). Published by Wolters Kluwer Health, Inc.

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