Rituximab as an Alternative Treatment for Refractory Granulomatous Hypophysitis

Background: Although glucocorticoids have been adopted as the main stay treatment for granulomatous hypophysitis, refractory cases have been treated by infliximab with success in multiple reported case.[1,2,3] Given the low prevalence, incidence of granulomatous hypophysitis[4] and the advent of biologics, evidence of rituximab’s efficacy are largely based on a handful of case reports[1,2,3] and needs more evidence to label its utility. We describe a case of recurrent primary granulomatous hypophysitis in a 48-year-old female who had significant treatment challenge until there was good response after initiation of rituximab. Clinical Case: Patient was a known case of granulomatous hypophysitis and had undergone total hypophysectomy. Despite this approximately a year after her surgery she had become symptomatic and had MRI changes. She was started on a succession of immunosuppressive agents and high dose steroids to control recurrent symptoms. Due to treatment failure and very high steroid dose, patient was eventually started on Rituximab and patient had significant improvement of her symptoms as well as resolution of the MRI changes. Conclusion: Although there is a lack of prospective, double blind and controlled studies this case study highlights the utility of Rituximab as a potent alternative treatment for refractory given the adverse effect associated with the steroids and other immunosuppressive agents. Reference statement: 1. Schreckinger M, Francis T, Rajah G, Jagannathan J, Guthikonda M, Mittal S. Novel strategy to treat a case of recurrent lymphocytic hypophysitis using rituximab. J Neurosurg. 2012 Jun;116(6):1318-23. doi: 10.3171/2012.2.JNS111456. Epub 2012 Mar 23. PMID: 22443503. 2. Xu C, Ricciuti A, Caturegli P, Keene CD, Kargi AY. Autoimmune lymphocytic hypophysitis in association with autoimmune eye disease and sequential treatment with infliximab and rituximab. Pituitary. 2015 Aug;18(4):441-7. doi: 10.1007/s11102-014-0592-7. PMID: 25224140. 3. Gu WJ, Zhang Q, Zhu J, Li J, Wei SH, Mu YM. Rituximab was used to treat recurrent IgG4-related hypophysitis with ophthalmopathy as the initial presentation: A case report and literature review. Medicine (Baltimore). 2017 Jun;96(24):e6934. doi: 10.1097/MD.0000000000006934. PMID: 28614220; PMCID: PMC5478305. 4. Angelousi A, Alexandraki K, Tsoli M, Kaltsas G, Kassi E. Hypophysitis (Including IgG4 and Immunotherapy). Neuroendocrinology. 2020;110(9-10):822-835. doi: 10.1159/000506903. Epub 2020 Mar 4. PMID: 32126548

Idiopathic granulomatous hypophysitis presenting with galactorrhea, headache, and nausea in a woman: a case report and review of the literature

Background Inflammation of the pituitary gland can occur in a variety of primary or secondary disorders. Idiopathic granulomatous hypophysitis is a rare inflammatory disease of the pituitary gland that can closely mimic a pituitary adenoma clinicoradiologically. Most authorities agree on minimally invasive transsphenoidal surgery as the mainstay in diagnosis and treatment of this disorder. There is still some controversy regarding pure medical management of idiopathic granulomatous hypophysitis in the literature. Case presentation A 47-year-old Iranian woman of Azeri ethnicity with a history of benign breast cysts with a chief complaint of galactorrhea presented to our endocrinology clinic. Her past medical history was negative for any menstrual irregularities, hirsutism, visual complaints, diplopia, polyuria and polydipsia or seizures. She was taking 100 mcg of levothyroxine daily. Her familial history and physical examination were unremarkable. Her initial laboratory work-up revealed hyperprolactinemia (82.4 ng/mL) with otherwise normal pituitary axes. Brain magnetic resonance imaging showed a pituitary macroadenoma for which she was treated with 0.5 mg of cabergoline weekly. Although her serum prolactin level dropped to 1.7 ng/mL and her galactorrhea was resolved, she continued to complain of headaches and nausea. Repeated imaging showed no decrease in size of the macroadenoma. Therefore, she underwent transsphenoidal surgery of the macroadenoma which was reported as chronic granulomatous hypophysitis by expert pathologists. Tuberculosis, sarcoidosis, Wegener’s granulomatosis, Langerhans cell histiocytosis, and syphilis were ruled out by appropriate tests and she was diagnosed as having idiopathic granulomatous hypophysitis. Fortunately, her condition was not complicated by hypopituitarism and she was symptom free 9 months after transsphenoidal surgery. Conclusions Idiopathic granulomatous hypophysitis, a rare inflammatory disease of the pituitary gland, is a diagnosis of exclusion for which both medical and surgical management are reported in the literature. We present a case of idiopathic granulomatous hypophysitis who was symptom free with no complications of hypopituitarism following its transsphenoidal resection after 9 months of follow-up.

Intracranial Germinoma Masquerading as Secondary Granulomatous Hypophysitis: A Case Report and Review of Literature

Germinomas are highly immunogenic tumors eliciting a strong peri-tumoral immune response that can spillover into the surrounding healthy tissues. This phenomenon can also occur in intracranial germinomas, manifesting as secondary hypophysitis. Herein, we report a case of 12-year-old-girl presenting with polyuria and polydispsia. She had central diabetes insipidus (CDI) and panhypopituitarism. Imaging revealed a sellar-suprasellar mass with infundibular stalk thickening. Transphenoidal biopsy revealed epithelioid granulomas with immunostaining negative for germinomatous cells. Other causes of hypophysitis were ruled out. Accordingly, she was diagnosed as primary granulomatous hypophysitis and treated with high-dose corticosteroids. Three years later she again presented with headache, vomiting and diminution of vision. Imaging showed a heterogeneous, solid-cystic peripheral rim-enhancing lesion at the same location with involvement of hypothalamus, ependyma and pineal gland. Cerebrospinal fluid beta-human chorionic gonadotropin was markedly elevated, confirming the diagnosis of an intracranial germ cell tumor. She was started on chemotherapy; however, she succumbed to febrile neutropenia. We performed a literature search and found 18 anecdotal cases of secondary hypophysitis associated with intracranial germinomas. There was a slight male preponderance (male:female 5:4). Two-thirds of the cases were below 18 years of age. Polyuria was the most common presenting manifestation (83%). CDI and panhypopituitarism were seen in 89 and 78% cases, respectively. Imaging evidence of pituitary stalk thickening was seen in 12 cases (67%), while pituitary enlargement and/or sellar mass were reported in 11 cases (61%). Pineal involvement was extremely rare, being reported in only 1 case, implying the predilection of suprasellar (rather than pineal) germinomas in causing secondary hypophysitis. Histologically, 82% had lymphocytic hypophysitis, while 18% had granulomatous hypophysitis. Initially, the diagnosis of germinoma was missed in 60% of the cases who were wrongly treated with corticosteroids. To conclude, physicians should make it a dictum that all children and adolescents presenting with CDI and pituitary stalk thickening should be rigorously screened for an underlying intracranial germinoma before labeling them as primary hypophysitis.