Primary granulomatous hypophysitis: a case report and literature review.

Primary granulomatous hypophysitis (PGH) is a rarely occurred inflammatory disease of unknown etiology. We retrospective review a case of PGH treated by microsurgical transsphenoidal approach and review the appropriately documented cases of PGH collected from the literatures. The patient was a 56-year-old female who presented with 4 months history of headache and 2 months history of polyuria and polydipsia. Clinic examination did not find remarkable neurological signs, except endocrinological abnormalities of secondary hypothyroidism and hypocorticalism. MRI revealed a symmetric sellar mass, which was isointensity as gray matter on T1-weighted and T2-weighted images with heterogeneous enhancement. The mass was partially resected via transsphenoidal approach. Histological assessment revealed a non-necrotizing granulomatous lesion with chronic inflammation. Although the resection was limited, repeatedly MRI scanning in 3 months following surgery revealed almost normal pituitary soft tissue without evidence of the lesion. Searching in PubMed, we found 21 papers published from 1985 to 2009 and 37 patients with PGH were reported. In order to identify the clinical and radiological presentation, treatment strategy, and prognosis of PGH, we analyzed these 38 cases together. The results indicate that the clinical presentations and radiological signs are helpful for the diagnosis of PGH. The outcome of surgery for PGH is favorable for immediate mass reduction and histological diagnosis, but hormone replacement is required in most cases and long-term follow up is very important.