Progressive metastatic pheochromocytoma induced by multiple endocrine neoplasia type 2A with a lethal outcome

Area of Science:

• Endocrinology
• Oncology
• Genetics

Background:

• Multiple Endocrine Neoplasia type 2A (MEN2A) is an inherited disorder associated with RET gene mutations.
• Patients typically develop medullary thyroid carcinoma (MTC), pheochromocytoma, and hyperparathyroidism.
• MEN2A-associated pheochromocytoma, while often benign, carries a small risk of metastasis.

Observation:

• A 62-year-old male presented with bilateral pheochromocytoma, liver and bone metastases, and a cardiac thrombus.
• Genetic analysis revealed a RET gene variant at codon 634, indicative of MEN2A.
• Initial assessment suggested metastases were from MTC, but a liver biopsy confirmed pheochromocytoma metastasis.

Findings:

• The patient's metastases originated from pheochromocytoma, not MTC.
• This presentation underscores that pheochromocytoma can metastasize in the context of MEN2A.
• The presence of metastatic pheochromocytoma complicated the initial diagnosis.

Implications:

• Diagnostic delays in MEN2A can occur if pheochromocytoma presents with metastases before MTC.
• Accurate diagnosis is crucial for appropriate management of MEN2A patients.
• This case emphasizes the need to consider pheochromocytoma metastasis in MEN2A diagnosis.