Unusual location for langerhans cell histiocytosis: Basisphenoid extended to parapharyngeal space

Langerhans cell histiocytosis (LCH) is a rare disease with unknown etiology involving abnormal proliferation of histiocytes. We hereby describe an LCH that has a rare location. A 4-year-old female patient was referred to our clinic with headache lasting for 2 months. Magnetic resonance imaging (MRI) showed an expansile mass on the level of basisphenoid extended to the right parapharyngeal space with dense contrast enhancement. The patient underwent endoscopic endonasal transsphenoidal surgery for biopsy of the mass. Immunohistochemical and pathological studies confirmed LCH diagnosis. This is the first case report of LCH extended to the parapharyngeal space in the current literature.