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  A 30 year old male with headache and abnormal cranial magnetic resonance imaging

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A 30 year old male presented with history of mild intermittent diffuse headache of few weeks' duration. There was no history of vomiting, visual disturbances, diplopia, cranial surgery, or radiotherapy. On examination he was of average built, with body mass index (weight in kg divided by height in m2) of 23. Clinically he appeared tense and anxious. Blood pressure was normal. Fundi and visual fields were normal. There was no focal neurological deficit. There were no clinical evidences of thyroid, gonadotrophin, or glucocorticoid insufficiency. Other general and systemic examinations were normal. Cranial magnetic resonance imaging (MRI) was done (fig1).

Questions

(1)
What is the abnormality seen on MRI?
(2)
What are the two main types of this abnormality?

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