# Intraoperative vascular ligation uncovers the role of tumor vasculature in Doege-Potter syndrome: a case report

## TL;DR

A case report shows that cutting off blood supply to a tumor during surgery can stop hypoglycemia caused by Doege-Potter syndrome.

## Contribution

This is the first direct evidence that tumor vasculature is critical for clinically significant hypoglycemia in Doege-Potter syndrome.

## Key findings

- Ligation of tumor vessels during surgery led to normalization of blood glucose levels.
- Tumor vasculature plays a key role in the release of big-IGF2 causing hypoglycemia.
- These findings complement existing knowledge on molecular mechanisms of NICTH.

## Abstract

Solitary fibrous tumor (SFT) is a rare mesenchymal neoplasm that may present with non-islet cell tumor hypoglycemia (NICTH), also referred to as Doege-Potter syndrome, primarily due to aberrant secretion of big-IGF2. However, not all big-IGF2-producing SFTs result in hypoglycemia, implying the involvement of additional pathogenic factors. This article reports a case of a 60-year-old male who presented with hypoglycemic syncope secondary to Doege-Potter syndrome. Preoperative imaging identified a large, highly vascularized SFT, approximately 20 cm in diameter, located in the right thoracic cavity. Intraoperative continuous glucose monitoring (CGM) recorded a gradual normalization of blood glucose levels following sequential ligation of three dominant tumor vessels originated from veins- prior to tumor resection - underscoring the essential role of tumor vascular in facilitating big-IGF2 release. Our findings provide the first direct evidence that tumor vasculature is critical for manifesting clinically significant hypoglycemia, thereby complementing established molecular mechanisms such as IGF2 overexpression and impaired pro-IGF2 processing. These insights advance the understanding of NICTH pathogenesis and hold meaningful implications for refining surgical management strategies.