[Case of Nelson syndrome].

Area of Science:

• Endocrinology
• Oncology
• Pathology

Background:

• Nelson syndrome is a rare complication following bilateral adrenalectomy for Cushing's disease.
• It is characterized by the development of a pituitary tumor and clinical signs of hypercortisolism.

Observation:

• A 44-year-old woman developed Nelson syndrome four years post-adrenalectomy.
• Histological examination revealed a pituitary adenoma of mixed structure.
• Electron microscopy identified the tumor as corticotropocytes in various secretory stages.

Findings:

• The pituitary adenoma in this case consisted of corticotropocytes.
• The tumor exhibited characteristics consistent with Nelson syndrome.
• The diagnosis was made four years after the patient underwent bilateral adrenalectomy.

Implications:

• This case highlights the importance of long-term pituitary surveillance after bilateral adrenalectomy.
• Understanding the cellular composition of pituitary adenomas in Nelson syndrome is crucial for diagnosis and management.
• Further research into the pathogenesis of pituitary tumors in Nelson syndrome is warranted.