Surgical management of malignant tumors of the trachea: report of two cases and review of literature.

Malignant neoplasms occurring from the trachea are extremely rare. Therefore, their clinical characteristics and surgical results have not been thoroughly discussed. These tumors are often misdiagnosed and treated as bronchial asthma or chronic obstructive pulmonary disease. It is critically important to probe the cause-effect relationship between the medical presentations and the clinical diagnosis. In this report, two cases of tracheal malignancy suffering from dyspnea due to obstruction of the proximal trachea are described, and a review of the literature is presented.

Introduction

Malignant neoplasms of the trachea are extremely rare. Grillo and Mathisen [1] reported that tracheal tumors account for only 2% of all lung tumors. Therefore, their clinical characteristics and surgical results have not been thoroughly discussed. In addition, there are extremely variable clinical and histological features [2, 3]. These tumors are often diagnosed late on account of delayed specific symptoms (blood sputum, coughing, dyspnea) [4, 5, 6]. The patients are often treated as bronchial asthma patients, and this misdiagnosis delays the proper treatment, leading to the inoperability of the tumor.

The present study reports two cases of tracheal malignancy suffering from dyspnea due to obstruction of the airways and describes the clinical features of this rare disease.

Case Reports

Case 1

A 58-year-old man with a history of 40 cigarettes per day for 35 years presented to our hospital complaining of blood-streaked sputum and dyspnea. Two years before, he had suffered from laryngeal carcinoma and underwent radiotherapy (66 Gy) to the larynx in another hospital. A computed tomography (CT) and bronchoscopy documented a cauliflower-like, warty tumor (fig. ). The main tumors were located 25 and 50 mm below the vocal cords. Biopsy revealed squamous cell carcinoma (SCC). It was difficult to determine whether the tumor was a primary tracheal tumor or a recurrence of the previously treated laryngeal cancer. We started tracheostomy under local anesthesia to remove the tumors and secure his airways. After completing tracheostomy, radical surgery was carried out. The gross tumor extension did not exceed 5 cm up to the carina. However, the residual trachea was too short to perform a standard tracheostoma, and we decided to resect the manubrium, the clavicular head and the first costal cartilages to perform a mediastinal tracheostomy, as described by Grillo [7]. We performed the relocation of the trachea inferior to the innominate artery to avoid a potentially hazardous ligation of this vessel. The mediastinal stoma and upper mediastinal defect were covered by a pectoralis major myocutaneous flap, as described by Biller et al. in 1980 [8]. This confident flap provided well-vascularized muscle to fill the dead space in the upper mediastinum and created a bulky interposition between the trachea and innominate artery (fig. ). The postoperative course was uneventful and the patient was discharged home on the 20th postoperative day. The patient had an excellent long term outcome, and there was no evidence of recurrence after 20 months of follow-up.

Case 2

A 58-year-old woman presented with cough and breathlessness of 2 weeks duration. She denied a history of chest pain, hemoptysis, dysphagia and hoarsness of voice. Local examination of her neck revealed a 4 × 3 cm firm, nontender swelling fixed to the underlying structures. Other systemic examination was unremarkable. The patient was referred for fine needle aspiration cytology. Cytological findings revealed adenoid cystic carcinoma (ACC). Fiberoptic bronchoscopy was performed which showed a well-defined, solitary, smooth-surfaced mass at the anterior wall of the trachea. A CT showed a voluminous, wall-thickening, and solid tracheal mass of about 3–4 cm in length, extending from the subglottic space to the cervical trachea (fig. ). We performed a tracheostomy under local anesthesia to secure her airways. After completing tracheostomy, an open biopsy was performed and histological findings revealed ACC. The patient underwent pharyngolaryngectomy, right neck dissection, and microvascular free jejunal transfer (fig. ). No perioperative and postoperative complications occurred and there was no evidence of recurrence after 18 months of follow-up.

Discussion

Tracheal tumors are rare and account for only 2% of all respiratory tract tumors. A variety of histological features of tracheal tumors have been reported, including benign, low-grade, and high-grade malignancies [4, 9].

SCC is the most common tracheobronchial malignancy and develops mainly in the 6th and 7th decades of life. This tumor is strongly associated with habitual cigarette smoking, affecting men two to four times more frequently than women [9, 10]. Approximately 40% of all tracheobronchial SCCs have been reported to occur before, concurrently with, or after carcinoma of the oropharynx, larynx, or lung. Our first case had a history of radiotherapy for laryngeal cancer.

ACC is the second most common tracheal malignancy determined at histology after SCC [10, 11]. ACC tends to occur in the central airways such as the trachea, main bronchus, or lobar bronchus; a peripheral or segmental location is uncommon. These tumors are generally thought to have low-grade malignant potential; however, they have a tendency for local recurrence and late development of distant metastasis. Because of their slow progression, these tumors cannot give any symptoms until airway obstruction occurs.

Common symptoms of tracheal malignancies include breathlessness, cough, hemoptysis, dysphagia, and stridor. However, these tumors are sometimes misdiagnosed because the symptoms can mimic those of asthma or chronic obstructive pulmonary disease [3, 12]. Our ACC case was also treated first as an asthma patient for 2 months.

Rapid evaluation of the tumor (severity of tracheal stenosis, location, length, and invasion status) and the possibility for surgical resection is the most important strategy for patients with stenosis of the central airways due to tracheal tumors. CT is a useful imaging procedure for tracheal tumors [13]. The conventional CT scan of the chest and trachea is recommended for this kind of tumor, and endoscopic examination is the best way to evaluate obstruction.

A complete resection, if possible, provides the best potential benefit as well as symptomatic relief for patients with primary tracheal tumors such as SCC and ACC [14, 15]. However, because tumors with malignant potential tend to infiltrate along the airways, they are often incompletely resected and thus prone to recur locally. The complete resection rates in reported cases range from 42 to 57%. In our cases, we could treat the patients surgically by the total removal of the larynx and its reconstruction, performing mediastinal tracheostomy (first case) or pharyngolaryngectomy (second case). External beam irradiation has commonly been used for palliative treatment of tracheal cancer and its palliative potential is reasonable [16]. Several studies have demonstrated the value of radiotherapy in controlling primary tumors of the trachea, providing good palliation in 75% of the patients and a 5-year survival rate of up to 10% [17, 18].

Prognosis of patients with tumors of the trachea remains poor. Extensive resection provides disease control and allows to obtain 5-year survivals for 20–40% of the SCC patients and 60–100% of the ACC cases[1, 19].

In conclusion, we reported two cases of tracheal cancer with stenosis of the proximal trachea. It is critically important to probe the cause-effect relationship between the medical presentations and the clinical diagnosis. Failure to respond to general therapy suggests that the primary diagnosis should be suspected. A smoker presenting dyspnea could be carrier of a tracheal neoplasm, and early diagnosis is very important for its management.