Triple sellar collision lesion: a unique case of pituitary adenoma, Rathke cleft cyst, and xanthogranuloma-case report and systematic review of the literature.

The coexistence of three lesions in the sellar region is exceedingly rare. Only two cases with three histopathologically distinct lesions have been reported. However, here, we present a unique case of a 54-year-old female with pituitary adenoma (PA), xanthogranulomatous hypophysitis (XGH), and a Rathke cleft cyst (RCC). Clinically, the patient manifested symptoms of mass compression, such as moderate-intensity headaches and progressive visual acuity decrease. Relevant endocrinological evaluation revealed elevated free thyroxine levels without clinical manifestations. MRI revealed a suprasellar mass compatible with a macroadenoma. The patient underwent transsphenoidal endoscopic resection, resulting in a non-functional macroadenoma with associated XGH due to the rupture of RCC. Furthermore, in this article, we analyze the possible mechanisms involved in the pathogenesis of these lesions, emphasizing the type of spectrum to which they belong and the manifestations present.