Rare tumour mimicking meninigioma: A case of primary intracranial amelanotic malignant melanoma with negative staining of S100 and HMB‐45

Primary intracranial malignant melanoma is a rare disease, and the imaging findings usually mimic meningioma. Diagnosis is based on histology. Here, we report a case of primary intracranial malignant melanoma in a Chinese patient. A 27‐year‐old man presented with a 1‐month history of headache. Magnetic resonance imaging findings resembled features of a meningioma. Craniotomy with tumour excision was done and confirmed to be S100 and human melanoma black 45‐negative primary intracranial malignant melanoma. There was no extracranial involvement. The 9‐month follow up was reported. To our knowledge, this is the first reported S100 and human melanoma black 45‐negative primary intracranial amelanotic malignant melanoma.