Comparison of surgical approaches and outcome for symptomatic pineal cysts: microscopic/endoscopic fenestration vs. stereotactic catheter implantation.

[PURPOSE] Treatment strategies for space-occupying/symptomatic pineal cysts (PC) are still up for debate. In this study we present PC management, outcome data and risk factors for recurrence after surgery, focusing on microscopic/endoscopic procedures vs. stereotactic catheter implantation as alternative treatment concept to permanently drain PC into ventricles/cisterns.

[METHODS] This monocentric retrospective analysis included clinical data from all consecutive PC patients treated surgically between 2000 and 2022. Postoperative neurological and functional outcomes, along with perioperative complications, as well as time to PC recurrence and MR-morphological data were evaluated.

[RESULTS] 39 patients (median age 32.6 years, range: 5.1-71.6 years) were analyzed. Main presenting symptoms were headaches, visual impairment, and epileptic seizures. In 18 patients (46.2%) an enlarged ventricular system was preoperatively found with 7 patients (18.0%) suffering from occlusive hydrocephalus. 14 patients underwent microscopic/endosocopic surgery, in 25 cases stereotaxy was preferred. No complication was seen in the microsurgery/endoscopy group compared to one intracystic postoperative bleeding (2.6%) and two CSF leaks (5.1%) after stereotaxy (p = 0.5). Overall, clinical improvement and significant cyst volume reduction (p < 0.0001) was seen in all patients. Recurrent PC were seen in 23.1%, independent of surgical procedure (p = 0.2). In cases of recurrence, TTR was 25.2 ± 31.2 months. Male gender (p = 0.01), longer surgery time (p = 0.03) and preoperatively increased Evans index (EI) (p = 0.007) were significant risk factors for PC recurrence in multivariate analysis.

[CONCLUSION] In patients suffering from PC, microsurgical and stereotactic approaches can improve clinical symptoms at low procedural risk, with equal extent of volume reduction. However, preoperative ventricular enlargement and EI values should be considered for optimal treatment planning to reduce recurrence.