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A retroperitoneal bronchogenic cyst with malignant change
S M Sullivan1, S Okada, M Kudo
1Second Department of Pathology, Tokyo Medical University, Japan.
Pathology International
|June 12, 1999
Summary
This report details a rare adenocarcinoma originating in a retroperitoneal bronchogenic cyst. This unique case highlights a novel presentation of a malignant tumor within a congenital cyst.
Area of Science:
- Gastroenterology
- Pathology
- Oncology
Background:
- Bronchogenic cysts are congenital abnormalities typically found in the mediastinum.
- Malignant transformation within bronchogenic cysts is exceedingly rare, with few documented cases.
Observation:
- A 55-year-old woman presented with abdominal discomfort and a retroperitoneal cystic mass.
- Computed tomography identified the mass attached to the ascending colon.
- Histological examination revealed well-differentiated papillary adenocarcinoma within the cyst wall, with areas of atypical epithelium.
Findings:
- The resected cyst contained mucus and debris.
- The cyst wall showed features suggestive of bronchial structures, including smooth muscle and thickened basement membrane.
- Mucin staining for gastrointestinal, cholecystic, and uterine cervical mucins was negative.
Implications:
- This is the first reported instance of adenocarcinoma arising in a retroperitoneal bronchogenic cyst.
- The findings expand the known spectrum of extrathoracic presentations of bronchogenic cyst-associated malignancies.
- Further research is needed to understand the pathogenesis and optimal management of such rare tumors.