Collision tumor of the sellar region: Coexistence of papillary craniopharyngioma and thyrotropin-secreting pituitary adenoma-A case report.

Collision tumors in the sellar region are uncommon, most frequently composed of pituitary adenomas and Rathke's cleft cysts. However, the coexistence of a craniopharyngioma and a pituitary adenoma represents an exceedingly rare entity. Here, we report a unique case of a 60-year-old woman presenting with progressive bilateral visual decline. Neuroimaging identified distinct sellar and suprasellar masses. The patient underwent endoscopic endonasal surgery with gross total resection (GTR). Postoperative histopathological analysis confirmed a collision tumor consisting of a papillary craniopharyngioma and a thyrotropin (TSH)-secreting pituitary adenoma. To the best of our knowledge, this is the first documented case of coexisting papillary craniopharyngioma and TSH-secreting pituitary adenoma in the sellar region.