Highly proliferative sellar chordoma with unusually rapid recurrence

Chordomas are tumors of notochordal differentiation of low to intermediate grade malignancy. These tumors are typically slow growing, with an indolent but progressive clinical course. We present a case of a highly proliferative chordoma arising in a 73‐year‐old woman with unusually rapid clinical growth and aggressive histologic and immunohistochemical features. This patient had an unusually brief preclinical course and within 1 month of developing headaches presented to medical attention with diplopia. The resected chordoma showed uncommonly elevated mitotic activity, without the histologic hallmarks of de‐differentiation. This proliferative activity correlated with elevated Ki67 staining (60%), B‐cell leukemia/lymphoma1 (BCL1) expression (100%), and topoisomerase IIα staining (>95%). E‐cadherin expression was also lost throughout the majority of the tumor. Other markers of epithelial mesenchymal transition (EMT) including vimentin, N‐cadherin, Slug and Twist, were also strongly expressed in this aggressive tumor. The sellar component of the tumor recurred within a 2‐month interval. The evaluation of the additional biomarkers, including makers of EMT studied in this, case may allow for identification of aggressive chordomas in which the tempo of disease is significantly more rapid than in typical cases of chordoma.