Infratemporal Fossa Glial Choristoma (Heterotopia): A Rare Presentation

department with a history of gradual painless swelling over the left side of her face for 4 months. Physical examination revealed asymmetric appearance of the face, with a 120 × 70 mm non-tender, non-mobile, and non-pulsatile prominent soft tissue mass with a smooth contour in the left parotid and periauricular spaces. Neurological examination was unremarkable. On ultrasound examination, a solid cystic mass in the parotid space was recognized, but precise determination of the depth, margin, and extension of the mass was not possible, and complementary diagnostic studies were necessary. MRI of the skull base and face (Figure 1) in axial (A) and sagittal (B, F) T2-weighted, coronal unenhanced (C) and post-contrast (D, E) T1-weighted sequences shows a multilobulated solid-cystic soft tissue massoccupying the infratemporal fossa with extension into the parotid and parapharyngeal spaces, without any significant enhancement. The mass was exerting pressure on adjacent structures, with no obvious intracranial and brain communication. Vascular or lymphatic malformation, teratoma, encephalocele or meningocele, neoplastic lesion (such as rhabdomyosarcoma), and adenoid cystic carcinoma were considered in the differential diagnosis [1]. The patient underwent surgical resection, and the histological examination of stained sections from the infratemporal lesion showed a mass of glial tissue that consisted of several pieces of creamy-brownish tissue, consistent with glial heterotopia. On follow-up, the infant experienced unaffected development and remained asymptomatic, with no recurrence after one year.