Discussion
Diagnosis With Brief Discussion
- Diagnosis
- Benign Bronchoesophageal Fistula (associated with chronic pneumonia)
- Radiologic Findings
- Chest radiograph shows a bulging opacity in the left lower lobe obliterating the descending aortic margin. CT shows a segmental consolidation in the left lower lobe abutting the esophagus and the thoracic aorta. In the area of consolidation, a tubular low density of fluid-filled bronchus looks extending into the esophageal lumen. Below the level of this connection, there is a small radiopaque spot in the consolidation area with marked luminal dilatation of the esophagus. Neither esophageal mass nor other mediastinal disease was defined on the CT images. Following the impression of broncho-esophageal fistula (BEF) on the CT, large BEF tract was noted on the endoscopy (A) and a communication between the lower esophagus and the posterobasal segmental bronchus was demonstrated on the esophagogram (B). Without any evidence of fibrosis, inflammation or lympahdenopathy around the esophagus, a congenital fistula or foreign body erosion could be considered in this case.
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A
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B
- Brief Review
- Different from the common events of malignant BEF, benign BEFs are rare and about 120 cases have been reported in the English literature. They can be congenital or acquired. Acquired BEFs were more frequently reported than congenital types and induced by traumatic, inflammatory (tuberculosis, histoplasmosis), or iatrogenic origin (including foreign body).
Compared to tracheo-esophageal fistulas, which has pronounced symptoms, benign BEF presents with rather inconspicuous and insidious symptoms such as chronic cough or asthma not responding to treatment. Those nonspecific symptoms may delay a correct diagnosis (as was the case in our patient).
A wide array of diagnostic tools is applicable in the diagnosis of BEF. Plain radiography and CT scan of chest can give information of the lungs and the mediastinum, but they may not confirm the clinical suspicion. Endoscopic examinations of bronchi and esophagus may fail to identify the anomalous orifice but may reveal inflammatory changes and exclude a malignancy. Esophagography with dilute barium is almost always decisive in the diagnosis of BEF even if sometimes, despite thorough investigation, the diagnosis is made only at surgery. In this case, CT gave a very helpful information, and esophagoscopy and esophagogram confirmed the diagnosis of BEF.
Once diagnosed, benign BEFs require immediate surgical treatment because of the risk of chronic sepsis, wider tissue destruction requiring additional surgery or fatal massive hemoptysis.
- References
- 1. Mangi AA, Gaissert HA, Wright CD, et al. Benign broncho-esophageal fistula in the adult. Ann Thoracic Surg 2002; 73; 911
- Keywords
- esophagus, infection,