Hypophysitis in COVID-19: a systematic review.

Purpose: This systematic review aims to collect and examine recent research findings regarding hypophysitis in COVID-19 patients.

Method: We conducted a comprehensive literature review in English on the topic "Hypophysitis in COVID-19," using the MEDLINE (PubMed) database in July 2024. The selected articles were systematically tabulated and we have assessed in this review patient demographics, symptom presentation, imaging results, diagnosis, clinical management, and outcomes.

Results: Seven reported cases of post-COVID-19 hypophysitis were identified, comprising 4 (57%) females and 3 (43%) males, with a median age of 37 years. The interval between COVID-19 infection symptoms and the onset of hypophysitis ranged from 2 to 3 weeks. Initial symptoms included frontal headache in 4 (57%) cases and polyuria and polydipsia in 3 (43%) cases. Anterior or posterior hypopituitarism was observed in 6 (85%) patients. Radiological findings varied: 2 (28.5%) cases showed panhypophysitis, 3 (43%) cases exhibited gland enlargement with homogeneous contrast enhancement on magnetic resonance imaging (MRI), 1 case involved the loss of the posterior pituitary bright spot, and 1 case involved pituitary apoplexy/enlargement of the gland and infundibulum. No pituitary biopsies were performed. Four (57%) patients received glucocorticoid (GC) treatment. Long-term follow-up was documented in only one case, a 16-year-old female followed for 2 years reporting complete clinical and radiological resolution.

Conclusion: Although rare, hypophysitis related to COVID-19 is documented in the literature exhibiting distinct characteristics such as a homogeneous gender prevalence, an average age of onset around 35 years, and primary symptoms of headache, polyuria, and polydipsia which are indicative of angiotensin-vasopressin deficiency. This is in contrast with primary autoimmune hypophysitis characterized by a female prevalence and typical symptoms with headache and visual impairment. Longer-term follow-up of these patients is needed to better understand the potential lasting impact on pituitary function and radiological improvement. Future research should also explore the presence of anti-pituitary antibodies and the other possible pathophysiological mechanisms potentially involved in these cases.