Severe headache during pregnancy turned out to be a 1-in-9-million pituitary disorder after symptoms were mistaken for migraine

A 29-year-old pregnant woman with a history of two previous abortions was successfully treated for an extremely rare and potentially life-threatening pituitary condition during her second trimester through timely diagnosis, multidisciplinary intervention, and complex neurosurgical management.

The patient, who was 14 weeks pregnant with a precious pregnancy, presented with severe headache, persistent vomiting, and blurring of vision. Initially, she was evaluated elsewhere and treated for migraine, as she had a prior history of migraine headaches. However, her symptoms continued to worsen despite medication, raising concern among the treating doctors that the headache was not typical in nature.





After detailed counseling regarding the safety of imaging during pregnancy, an MRI brain was performed. The scan revealed a sellar–suprasellar pituitary mass compressing the optic chiasm, the structure responsible for transmitting visual signals from the eyes to the brain. Compression of the optic pathways had already resulted in visual impairment, and further evaluation confirmed bitemporal hemianopia, a condition causing loss of peripheral vision on both sides.

Doctors suspected pituitary apoplexy, a rare endocrine emergency occurring in approximately 1 in 10,000 individuals, where bleeding or sudden enlargement within a pituitary lesion can rapidly threaten vision, hormonal balance, and even life. Since pituitary gland function regulates several critical hormonal systems in the body, untreated progression could have resulted in permanent blindness, hormonal collapse, or severe maternal complications.

Managing the condition was particularly challenging because the patient was pregnant and highly anxious about undergoing surgery due to the risk to the fetus. Specialists explained that the second trimester is generally considered the safest period for necessary surgeries during pregnancy, as the major phase of fetal organ development is usually completed and the uterus is comparatively smaller.

A multidisciplinary team involving specialists from Obstetrics, Endocrinology, Ophthalmology, and Neurosurgery was formed to carefully plan her treatment. The patient was immediately started on steroid and hormonal support therapy to stabilize her condition.

Given the progressive visual symptoms and risk of permanent vision loss, the team proceeded with an endoscopic endonasal transsphenoidal decompression surgery under neuro-navigation guidance. The minimally invasive procedure was performed successfully with continuous maternal and fetal monitoring throughout the surgery.

Postoperatively, the patient developed diabetes insipidus, a known complication related to pituitary surgery, which was promptly identified and medically managed. Her vision improved significantly after surgery, and both maternal and fetal conditions remained stable.

Interestingly, while the initial clinical diagnosis suggested a pituitary adenoma with apoplexy, the final histopathology report revealed an exceptionally rare condition known as necrotizing granulomatous hypophysitis, reported to occur in nearly 1 in 9 million cases. This rare inflammatory disease affects the pituitary gland and can closely mimic pituitary tumors clinically and radiologically.

Dr Mridula Devi A, Consultant - Obstetrics and Gynaecology, said, “Managing a neurosurgical emergency during pregnancy requires extremely careful balancing of maternal and fetal safety. In this case, timely intervention, close fetal monitoring, and coordinated multidisciplinary care helped us successfully continue the pregnancy while preventing permanent complications for the mother.”

Following surgery, the patient was continued on hormone replacement therapy and remains under close follow-up. Her pregnancy has continued successfully, and doctors plan to reassess her long-term management after delivery.

The case highlights the importance of early recognition of atypical neurological symptoms during pregnancy, timely imaging, multidisciplinary coordination, and individualized patient counseling in managing rare and complex maternal conditions while ensuring fetal safety.