Current topics in neuropathology. Cushing's disease

Area of Science:

• Endocrinology
• Neurosurgery
• Pathology

Background:

• Cushing's disease is frequently caused by pituitary corticotroph microadenomas, accounting for up to 90% of cases.
• These tumors can co-secrete ACTH and other pro-opiomelanocortin-derived peptides, potentially explaining diverse clinical manifestations.
• A minority of cases may originate from primary hypothalamic or central abnormalities, presenting as normal pituitary glands or hyperplasia.

Purpose of the Study:

• To elucidate the underlying pathology of Cushing's disease using advanced investigative techniques.
• To correlate hormonal secretion and pathological findings for better disease subtyping.
• To improve diagnostic capabilities for identifying distinct patient groups.

Main Methods:

• Application of electron microscopy and immunohistochemistry to pituitary tissue.
• Analysis of hormone secretion and responses to biochemical testing.
• Correlation of clinical presentation with pathological findings.

Main Results:

• Confirmation that corticotroph microadenomas are the predominant cause of Cushing's disease.
• Identification of co-secretion of various peptides by pituitary tumors.
• Recognition of a subset of patients with central abnormalities, not identifiable by current biochemical tests.

Conclusions:

• Selective transsphenoidal adenomectomy is a primary treatment due to the high incidence of single microadenomas.
• The current inability to biochemically distinguish central abnormalities necessitates further research.
• Prospective studies correlating hormone data and pathology are crucial for understanding Cushing's disease variants.