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Malignant pheochromocytoma with ACTH production
Acta Pathologica Japonica
|November 1, 1984
Summary
This case report details a malignant pheochromocytoma producing ectopic adrenocorticotropic hormone (ACTH). Autopsy revealed high noradrenaline and ACTH levels, confirming an adrenal medulla APUDoma.
Area of Science:
- Endocrinology
- Oncology
- Pathology
Background:
- Pheochromocytomas are rare neuroendocrine tumors arising from chromaffin cells.
- Ectopic hormone production, such as adrenocorticotropic hormone (ACTH), can occur in malignant pheochromocytomas.
- This case investigates a rare instance of malignant pheochromocytoma with ectopic ACTH secretion.
Observation:
- Autopsy of a 54-year-old woman revealed a malignant pheochromocytoma of the left adrenal gland.
- Elevated levels of noradrenaline were detected in 24-hour urine and left adrenal vein blood.
- Tumor tissue and plasma exhibited abnormally high levels of ACTH.
Findings:
- Hormone assays confirmed ectopic ACTH production by the adrenal tumor.
- Formaldehyde fume fluorescence demonstrated biogenic amines within the tumor cytoplasm.
- Electron microscopy revealed numerous neurosecretory granules, characteristic of APUD (amine precursor uptake and decarboxylation) cell origin.
Implications:
- This case highlights the diagnostic challenges of malignant pheochromocytoma with ectopic ACTH production.
- Understanding the APUDoma nature of such tumors is crucial for accurate diagnosis and treatment.
- Further research into the molecular mechanisms of ectopic hormone production in pheochromocytomas is warranted.