Giant Pituitary Tumors Linked to Higher Risk of Postoperative Stroke

Surgery on unusually large pituitary tumors carries a significantly elevated risk of postoperative cerebral infarction, according to a retrospective study published in BMC Neurology. Among 100 consecutive patients with pituitary neuroendocrine tumors (PitNETs) operated on at a single institution between January 2015 and December 2024, none of the patients with smaller tumors suffered a postoperative stroke, while four of nineteen patients with giant PitNETs did.

The authors of the new study note that a detailed understanding of these complications matters both for improving treatment outcomes and for obtaining proper informed consent from patients before surgery.

The researchers reviewed institutional clinical data retrospectively, identifying cases of giant PitNETs and comparing them with cases of non-giant tumors. The two groups showed no significant differences in age, sex, operation time, or recurrence rate. However, patients with giant tumors stayed in the hospital significantly longer after surgery, with a median postoperative stay of 15.0 days compared with 12.0 days for the non-giant group, a difference the authors report as statistically significant.

The most striking difference was in cerebrovascular outcomes. Postoperative cerebral infarction occurred in four patients with giant PitNETs and in zero patients with smaller tumors, a difference that reached statistical significance. In the other three cases, the cause was mechanical compression of a cerebral artery by hemorrhage within residual tumor tissue left behind after the operation.

This mechanistic distinction underpins the study’s central conclusion. Because three of the four strokes stemmed from bleeding within leftover tumor compressing a cerebral artery, the authors suggest that maximal safe tumor removal may reduce the risk of postoperative cerebral infarction in giant PitNETs by reducing residual tumor hemorrhage. The finding frames the extent of surgical resection not merely as a question of tumor control but as a potential factor in preventing one of the most severe complications of these operations.

Not every complication differed between the groups. The study found no significant differences in the incidence of cerebrospinal fluid leakage, hypopituitarism, diabetes insipidus, or visual field deterioration when giant and non-giant PitNETs were compared. This pattern suggests that the excess cerebrovascular risk is a distinctive hazard of giant tumors rather than a blanket increase in all postoperative problems.

The authors emphasize the implications for surgical practice and patient communication. Before surgery for a giant PitNET, they write, surgeons must fully inform patients about the risk of postoperative cerebral infarction. Given that the complication arose in a substantial fraction of the giant-tumor group while appearing in none of the comparison group, the finding is likely to shape preoperative counseling discussions.

As with any single-institution retrospective review, the study’s scope has limits. It examined 100 consecutive patients treated at one center over a decade, of whom nineteen had giant tumors, and the four stroke cases all occurred within that small subgroup. The authors describe their work as an analysis of institutional clinical data rather than a multicenter trial, and the conclusions are observational associations drawn from that cohort. Even so, the message is clear: giant PitNETs carry a real risk of postoperative cerebral infarction, and both surgeons and patients should weigh that risk carefully when planning treatment.

Subject of Research: Postoperative cerebral infarction risk in surgery for giant pituitary neuroendocrine tumors

Article Title: Cerebral infarction as unexpected severe postoperative complication in giant pituitary neuroendocrine tumors

Article References: Yamamuro, S., Kobayashi, M., & Yoshino, A. (2026). Cerebral infarction as unexpected severe postoperative complication in giant pituitary neuroendocrine tumors. BMC Neurology. https://doi.org/10.1186/s12883-026-05554-5

Image Credits: AI Generated

DOI: 10.1186/s12883-026-05554-5

Keywords: pituitary neuroendocrine tumors, giant PitNETs, cerebral infarction, postoperative complications, neurosurgery, retrospective study, residual tumor hemorrhage, perforator injury, informed consent, BMC Neurology, pituitary surgery, hospital stay