• Hirotaka Hasegawa, Mark E Jentoft, William F Young, Nikita Lakomkin, Jamie J Van Gompel, Michael J Link, John L Atkinson, and Fredric B Meyer.
• Department of Neurologic Surgery, Mayo Clinic, Rochester, Minnesota, USA; Department of Neurosurgery, University of Tokyo Hospital, Tokyo, Japan.
• World Neurosurg. 2021 May 1; 149: e51-e62.

ObjectiveThe collision of pituitary adenoma and craniopharyngioma is extremely rare and thus there remains a paucity of data.MethodsWe described a patient from our institution. We also performed a systematic review and subsequent quantitative synthesis of the literature (n = 21) and our institutional case to yield an integrated cohort, and a descriptive analysis was carried out.ResultsTwenty-two patients (15 males and 7 females) were included in the integrated cohort. The median age was 47.0 years (range, 8-75 years). The tumor subtypes were 5 somatotropic, 5 lactotropic, 4 nonfunctioning, 3 gonadotropic, 2 corticotropic, 1 plurihormonal, and 1 silent subtype 3 for pituitary adenomas, and 19 adamantinomatous, 2 papillary, and 1 unknown subtype for craniopharyngiomas. Three different radiographic patterns were observed: solid mass with cystic component (n = 5), coexistence of two distinct solid components (n = 3), and a mixed-intensity solid mass (n = 5). The first 2 were consistent with histologically separate collision, whereas the third was consistent with histologically admixed collision. Among 19 patients in whom the postoperative course was recorded, a secondary intervention was required in 14 (73.7%) because of tumor progression or residual. The recurrence rate after gross total resection was 33.3%. Postoperative hormone replacement was required in 33.3%. The 10-year cumulative overall survival was 73.1%.ConclusionsMost craniopharyngiomas were adamantinomatous. There are 2 types of collisions: separated and admixed. Tumor control, overall survival, and endocrinologic remission are more challenging to achieve than for solitary tumors, but gross total resection of both tumors is important for satisfactory tumor control.Copyright © 2021 Elsevier Inc. All rights reserved.

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