Hypercalcemia in atypical bronchial carcinoid tumors

Area of Science:

• Oncology
• Endocrinology
• Pathology

Background:

• Atypical carcinoid tumors (ACTs) are rare neuroendocrine neoplasms of the bronchial tree.
• ACTs characteristically metastasize to bone, typically causing osteoblastic lesions.
• Calcium homeostasis is usually maintained despite bone metastases.

Observation:

• Two patients with ACTs presented with hypercalcemia and osteolytic bone metastases post-surgery.
• This presentation contrasts with the typical osteoblastic, normocalcemic metastatic pattern.

Findings:

• The patients exhibited hypercalcemia and osteolytic bone lesions, indicating an unusual metastatic behavior.
• In one case, chemotherapy led to remission of the cancer and resolution of hypercalcemia.

Implications:

• This case series highlights a rare but severe complication of atypical bronchial carcinoid tumors.
• It suggests that osteolytic metastases and hypercalcemia should be considered in patients with a history of ACTs.
• Chemotherapy may be a viable treatment option for managing hypercalcemia and metastatic disease in these patients.