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Adrenocorticotropin-producing pulmonary tumorlets with lymph node metastasis
Shian-Min Liu1, Hsing-Hsien Wu, Chieh-Jen Wu
1Department of Pathology, Tainan Municipal Hospital, Tainan, Taiwan. smliu@mail.tmh.org.tw
Pathology International
|November 25, 2003
Summary
Pulmonary tumorlets, small neuroendocrine growths, can metastasize and produce ectopic adrenocorticotropin (ACTH). This case highlights their potential carcinoid-like behavior and relevance in diagnosing Cushing
Area of Science:
- Pulmonary Pathology
- Endocrinology
- Surgical Oncology
Background:
- Pulmonary tumorlets are rare neuroendocrine proliferations often found incidentally.
- Bronchiectasis is a chronic lung condition characterized by airway damage and widening.
- Ectopic adrenocorticotropin (ACTH) production can lead to Cushing's syndrome.
Observation:
- A 65-year-old male with bronchiectasis presented with cough and hemoptysis.
- Right lower lobe lobectomy revealed multiple pulmonary tumorlets surrounding bronchioles.
- Tumorlets showed neuroendocrine features and lymph node metastasis.
Findings:
- The pulmonary tumorlets demonstrated ectopic ACTH production, though clinically silent.
- Immunohistochemistry confirmed the neuroendocrine origin of the proliferating cells.
- Metastasis to hilar lymph nodes was identified.
Implications:
- Pulmonary tumorlets may exhibit carcinoid-like behavior and require appropriate management.
- Ectopic ACTH production by tumorlets should be considered in Cushing's syndrome differentials.
- This case underscores the importance of thorough histopathological evaluation of pulmonary nodules.