Intravascular Papillary Endothelial Hyperplasia in Hypopharynx: A Case Report

Intravascular papillary endothelial hyperplasia (IPEH), also known as Masson’s hemangioma, is a rare benign vascular tumor. It presents as a reddish-blue firm mass, characterized by the proliferation of endothelial cells within blood vessels. IPEH can manifest in various body parts. In this article, we describe a 76-year-old male presenting intermittent oral bleeding and dysphagia. Laryngoscopy revealed a 2 cm protruding, irregular, reddish-blue, and slightly hemorrhagic tumor on the posterior hypopharyngeal wall. Computed tomography revealed a 2-cm soft tissue mass. The tumor was surgically excised using a CO<sub>2</sub> laser via suspension laryngoscopy. Histopathological examination revealed increased vascularity with papillary endothelial projections in the vascular lumen and no significant mitotic activity, leading to a diagnosis of IPEH. The patient exhibited a successful treatment outcome, with no recurrence observed over one year postoperatively. This case enhances our understanding of IPEH, emphasizing careful differential diagnosis and histopathological analyses to distinguish it from malignant lesions.