Female, 45 years old, with intermittent headaches, history of pituitary adenoma. Evaluate for interval change. A T1 hyperintense lesion within the posterior pituitary is again seen with some interval reduction in size. The lesion now measures 7 x 8 x 5 mm and previously measured 8 x 11 x 9 mm. The anterior portion of the gland continues to appear normal. The pituitary stalk deviates very slightly to the left similar to prior. A cyst along the left medial temporal lobe, situated within the quadrigeminal plate cistern, appears to reflect an arachnoid cyst based on review of prior exams.
1.Mild interval decrease in size of a posterior pituitary lesion.2.Redemonstration of a probable arachnoid cyst along the left medial temporal lobe.