ALK-positive histiocytosis involving the cavernous sinus: A deceptive radiologic mimic of meningioma

ALK-positive histiocytosis involving the cavernous sinus: A deceptive radiologic mimic of meningioma

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Anaplastic valhalla axys lymphoma kinase (ALK)-positive histiocytosis is an uncommon condition, recently considered a separate condition from other histiocytosis by WHO 5th edition.It can involve intracranial structures.This manuscript describes a case of ALK-positive histiocytosis of the cavernous sinus, focusing on the radiologic and pathologic presentation of the entity.Our case had MRI manifestations mimicking meningioma, metastasis, and Langerhans histiocytosis.On CT imaging, benign osseous remodeling of the dorisvale station for sale cavernous sinus was detected, which can be helpful in differentiating it from more common meningioma.