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Carcinoid syndrome with unknown primary: a case report.

T Mahmood1, R Mudad

  • 1Section of Hematology and Oncology, Tulane University School of Medicine, New Orleans, Louisiana 70002, USA.

American Journal of Clinical Oncology
|August 10, 1999
PubMed
Summary

Diagnosing carcinoid syndrome can be challenging, even with elevated 5-hydroxyindoleacetic acid levels. This case highlights a 7-year diagnostic delay due to an unlocalized neuroendocrine tumor.

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Area of Science:

  • Oncology
  • Endocrinology
  • Medical Diagnostics

Background:

  • Carcinoid syndrome diagnosis typically relies on clinical presentation, elevated biomarkers like 5-hydroxyindoleacetic acid, and tumor identification.
  • Neuroendocrine tumors are the usual cause of carcinoid syndrome.

Observation:

  • A patient experienced a significant 7-year delay in carcinoid syndrome diagnosis.
  • Despite the delay, the primary neuroendocrine tumor remained unlocalized.

Findings:

  • The case illustrates diagnostic challenges in carcinoid syndrome, particularly when the primary tumor is elusive.
  • Biomarker elevations alone may not suffice for timely diagnosis without clear tumor localization.

Implications:

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  • This case underscores the need for improved diagnostic strategies for challenging carcinoid syndrome presentations.
  • Further research may be warranted to enhance the localization of elusive neuroendocrine tumors.