Intracranial Rosai-Dorfman disease with the petroclival and parasellar involvement mimicking multiple meningiomas: A case report and review of literature.

RATIONALE:Rosai-Dorfman disease (RDD) is a rare non-Langerhans cell histiocytosis. Petroclival RDD is extremely rare. To the best of our knowledge, only 7 cases of petroclival RDD have been reported so far. Herein, we present the 8th case of intracranial RDD with the petroclival and parasellar involvement mimicking multiple meningiomas. PATIENT CONCERNS:A 57-year-old woman presented with a 1-year history of vision diminution and 1-month hearing loss in her right ear. DIAGNOSES:Contrast-enhanced Magnetic resonance imaging (MRI) of the brain demonstrated multiple well-defined, homogenous mass which closely related to the dura mater in the bilateral parasellar and petroclival regions range from the basement of anterior to posterior cranial fossa. The lesions were T1 isointense, T2 hypointense, and homogeneously enhanced. Initial diagnosis of multiple meningiomas was made according to MRI findings. Final diagnosis of RDD was confirmed by histopathological and immunohistochemical examinations after subtotal surgical resection. INTERVENTIONS:The patient received subtotal resection because multiple lesions were extensive. OUTCOMES:The vision diminution recovered well after the surgery but the hearing loss in her right ear was still persisted. LESSONS:Although rare, a standard RDD typically are dural-based, extra-axial, well-circumscribed masses mimicking meningioma, and presenting with characterized hypo to isointense on T1-weighted images, hypo to isointense on T2-weighted images, and obvious enhancement. Resection of the intracranial lesion is the most effective treatment. In case of subtotal resection, the application of adjunctive radiotherapy and/or steroid agents should be advised. Final diagnosis of RDD should be confirmed by histopathological and immunohistochemical examinations.