SAT-262 A Case of Pseudotumor Cerebri After Removal and Recurrence of ACTH-Producing Tumor

Introduction: Pseudotumor cerebri also known as idiopathic intracranial hypertension (IIH) is a condition of elevated cerebrospinal fluid pressure which as a result causes headaches and vision problems. Several case reports and studies have reported a relation of IIH with Cushing’s disease (CD) in adults and children, particularly after surgical or medical therapy. We describe a very uncommon presentation of persistent intracranial hypertension (ICH) in a patient with recurrence of cushing’s disease after her initial surgical resection. Case presentation:38-year-old African-American female with a BMI of 45, type 2 diabetes, HTN and history of Cushing’s syndrome from an ACTH-producing pituitary macroadenoma. She initially presented with increasing weight gain and features of Cushing’s syndrome including hypertension, hyperglycemia, truncal obesity and moon facies. Imaging studies showed a 2 cm intrasellar mass with suprasellar extension without compression of the optic chiasm. Hormonal evaluation confirmed Cushing’s syndrome from an ACTH-producing pituitary macroadenoma. Patient underwent initial trans-sphenoidal hypophysectomy (TSR) and was tapered down to physiologic doses of glucocorticoids. Post-operatively she started complaining of significant headaches and transient vision loss. She followed up with neuro-ophthalmology and was diagnosed with papilledema that was not present in the pre-operative examination. An LP (lumbar puncture) was recommended to assess for ICH, however patient declined the procedure. A year after, a second surgery had to be performed for recurrent pituitary adenoma. Unfortunately, a repeat MRI pituitary shortly after her second surgery revealed recurrent pituitary macroadenoma of 2.2 cm. Patient continued with headaches and underwent an LP with an opening pressure of 28 cm H20 (ICH > 26 cm H2O). She underwent a third TSR with follow up MRI showing gross total resection of the previously seen pituitary mass. For her ICH she was started on acetazolamide but was not able to tolerate due to paresthesias and metallic taste. Her symptoms have improved after her last resection and last MRI brain shows no residual tumor. She is currently on furosemide and focusing on weight loss. Conclusion: Our patient’s presentation is an interesting and unusual case because we believe she had both pseudotumor cerebri (IIH) and real tumor cerebri from the complications of her ACTH-secreting macroadenoma. The cause of IIH after treatment of cushing’s disease is believed to be mostly due to steroid withdrawal after surgical resection or medical treatment comprising hormonal control of cerebrospinal fluid production and absorption. In our patient we suppose that the persistent weight gain caused by the recurrence of her CD could also contribute to her IIH. The treatment in general is the same with physiologic doses of corticosteroids, diuretics and weight loss.