Monaldi cavernostomy for lung aspergillosis: A case report.

Pulmonary aspergillosis in patients with respiratory failure can severely affect the pulmonary functional status and may aggravate it through pulmonary suppuration, by recruitment of new parenchyma and hemoptysis, which can sometimes be massive, with lethal risk by flooding the bronchus. The treatment consists of a combination of medical therapy, surgery and interventional radiology. In small lesions, less than 2-3 cm, medical therapy methods may be sufficient; however, in invasive forms (larger than 3 cm) surgical resection is necessary. Surgical resection is the ideal treatment; nevertheless, when lung function does not allow it, action must be taken to eliminate the favorable conditions of the infection. In such cases, whenever the lung cavity is peripheral, a cavernostomy may be performed. Four cases of lung cavernous lesions colonized with aspergillus, in which the need for a therapeutic gesture was imposed by repeated small to medium hemoptysis and by the progression of respiratory failure, were evaluated, one of which is presented in the current study. Cavernostomy closure can be realized either surgically with muscle flap or spontaneously by scarring, after closure of the bronchial fistulas by epithelization and granulation. There were no recurrences of hemoptysis or suppurative phenomena. There was one death, a patient with severe respiratory failure caused by superinfection with nonspecific germs. However, in the case presented in this study, the patient recovered following cavernostomy, which seems to be an effective and safe method for cases in which lung resection is not feasible. Copyright: © Petreanu et al.

Introduction

Pulmonary aspergillosis is a lung disease secondary to the presence of a ubiquitous germ, Aspergillus fumigatus, which occurs mainly in immunodeficient individuals. Aspergillus fumigatus is often the most blamed fungus in Aspergillosis lung injuries. It is a ubiquitous germ that can be aggressive through systemic reactions, as well as local or disseminated development. There are five described anatomo-clinical forms. The allergic bronchopulmonary form involves the development of the germ in conditions of asthma or bronchiectasis with the onset of allergic immunological reactions. Another non-invasive type is the localized form of pulmonary aspergilloma, which is found in the development of mycetoma in conditions of localized pulmonary emphysema or intraparenchymal cavernous lesions, where it finds optimal conditions for development (humidity, darkness and lack of ventilation) (1-3). The extreme form of local invasion is chronic necrotizing aspergillosis with extensive pleuropulmonary injuries (4-6). The systemic extensive form in immunosuppressed individuals is represented by invasive pulmonary aspergillosis (7-9). A form of hypersensitivity pneumonia caused by inhalation of aspergillus particles is also described (10).

The localized form of pulmonary or chronic necrotizing aspergillosis has a high lethal potential outcome, both by progressively induced respiratory failure and by possible acute-associated complications, including pulmonary suppuration and hemoptysis. Aspergilloma usually occurs in old post-tuberculosis lung cavernous lesions (1-5,11,12). Through recurrent infections with periods of pulmonary suppuration and remission, additional parenchyma is recruited with each exacerbation, functionally excluding new parenchymal areas. In addition, by releasing endotoxins, the hypertrophy of the local bronchial vascularization is stimulated until they rupture and trigger hemoptysis, a complication with high immediate lethal risk by pulmonary flooding; it exposes the lesion to superinfection (13-18).

In the case presented in this study, the patient successfully underwent cavernostomy, a potentially effective and safe method for cases with life-threatening hemoptysis in which lung resection is not feasible.

Case report

Approval for the case report was obtained from the Ethics Committee of ‘Marius Nasta’ National Institute of Pneumology, Bucharest, Romania (no. 152/2020). Written informed consent was signed by the patient on 13.05.2020.

A patient with low social status, former smoker with a history of left pulmonary tuberculosis, cachexia, was admitted into the Department of Thoracic Surgery, ‘Marius Nasta’ National Institute of Pneumology, having presented repeated mild hemoptysis in the previous 3 weeks, bronchial suppurative phenomena and worsening respiratory failure manifesting through shortness of breath and hypoxemia.

Chest X-ray revealed a left apical pulmonary cavity (Fig. 1). The chest computed tomography (CT) showed a culminal cavity surrounded by consolidation, probably due to aspergillosis infection and aspiration of blood (Fig. 2).

Figure 1

Radiological aspects of caverna.

Figure 2

CT aspects of the lesion.

The bronchoscopy revealed an abnormal structure of the left upper lobe bronchus, suppurative characteristics and hemoptysis traces in the culminal bronchus. The bronchoscope reached the aspergillary cavity; it revealed 9 mm diameter through the upper left bronchus and culminal bronchus.

The pulmonary function test results indicated: FVC: 2.66 l, 74%, and FEV1: 800 ml after antibiotic treatment. The arterial blood gas tests indicated a resting hypoxemia of 70 mmHg. Considering the results, performing lung resection was not possible due to the extremely high risks involved; therefore, another procedure was necessary.

Preoperative care included embolization of the bronchial arteries, in order to avoid hemoptysis in the perioperative period. Antibiotic and antifungal treatment regarding the suppurative phenomena was established based on the antibiogram.

The therapeutic procedure of choice was Monaldi Cavernostomy, in optimal conditions. The procedure was carried out in the left axillary region, consisting of 4 lateral sections of the ribs resected (3-6), guided by peripheral contact of the cavern with the thoracic wall. Removal of the adjacent thickened pleura was performed, creating an opening, followed by removal of the mycetoma, cavity lavage and the identification of multiple bronchial fistulas inside the cavity (Fig. 3).

Figure 3

Intraoperatory image-cavernostomy.

The next step was determined by musculocutaneous flap to pleuropulmonary edge suture. No per primam suture of the fistulas was intended. Slightly compressive bandage was performed to enable aerial drainage of the bronchial fistulas. Subsequently, daily dressing of the wound was practiced. Antibiotic treatment, including antifungal treatment, was maintained for 3 weeks.

Furthermore, after 3 months, muscular myoplasty was necessary in order to fill in the cavity, to favor the closure of the remaining fistulas and a reopening of the skin stoma, which had a tendency of closing.

After 1 year, the patient did not present any episode of hemoptysis or suppurative process and no progressive degradation of respiratory function. Difficulty in speaking was present in the first two months after the surgery, being ameliorated by adducting the upper limb at the level of the skin stoma, due to major air losses through the bronchial fistulas. The difficulties of local care, local dressing, initially with betadine grooming and sterile dressing were overcome in approximately 3 weeks, the patient being independent after this period.

Discussion

The diagnosis of pulmonary aspergillosis is usually based on imaging, with the typical radiological aspect of intracavitary mycetoma being the Monod sign, especially in the context of tuberculosis-related history and clinical manifestations of recurrent hemoptysis. The bronchoscopy examination often reveals chronic bronchial alterations and, through bronchial aspiration, aspergillus fumigatus is identified (19,20).

The antifungal drug treatment is complementary to the surgical treatment, in order to limit the local suppurative effects (21-23). In addition, hemostatic drugs such as lysine derivatives type are used in order to decrease the postoperative hemorrhagic incidents, given the increased risk of bleeding by specific pleuropulmonary adhesions (13,24-26).

The interventional radiology treatment, the embolization of the hypertrophied bronchial artery, has a temporary effect (13,27) and it can be used preoperatively to avoid suppurative or hemoptysis perioperative episodes. Single embolization has a risk of recurrence of hemoptysis of over 50% because the environmental conditions that allowed the development of aspergilloma remain present (13,24).

The treatment of pulmonary aspergilloma in a single, non-invasive form or in chronic pulmonary aspergillosis, as well as the invasive form is a combined surgical, radiological and medical treatment (13,21-28). The therapeutic strategy is individualized for each patient (2,24,28). The ideal treatment is surgical, by removing the pulmonary caverns or cavities with favorable conditions for fungal development, thus excluding the maintenance factors of suppurative phenomenon or recurrent massive hemoptysis (2,28). In addition, adjusted procedures are recommended as much as possible, avoiding remnants of affected lung tissue.

Whenever there is a patient with pre-existing compromised lung function that makes lung resection not possible, alternative surgical solutions should be considered. The purpose is to abolish the pathological conditions for the development of this fungus, such as lung caverns or superinfected air bubbles.

Cavernostomy, which represents the conservative surgical treatment of invasive pulmonary aspergillosis, should be considered in cases with a lung function that does not allow pulmonary resection, but also in patients with comorbidities that prevent them from benefiting from major lung resections, as in pre-existing high-risk cardiovascular conditions (17,29-35). Da Silva et al (36) identified an indication for cavernostomy as the forms of chronic invasive pulmonary aspergillosis that require pleuropneumonectomy-fused intrapleurally with complete pulmonary destruction or with bilateral forms, usually occurring in immunocompromised patients or with modified clinical condition. Therefore, it can be indicated even in those with permissive respiratory function. The therapeutic objective is to abolish the conditions that lead to the development of Aspergillus by performing cavernostomy (34-36).

Cavernostomy is applied in selected cases with peripherally cavernous lesions colonized with Aspergillus, in close contact with the chest wall and its structures.

Height recommends closed drainage for 7-10 days, with intracavitary lavage with antifungals in the preoperative period (26).

It involves making an ‘H’-shaped skin incision centered on the cavity or on the pleurotomy orifice of the previously placed pleural drainage tube. The approach site is usually axillary to the posterior axillary line for the lesions found in the Fowler segment, but also interscapular vertebral approach for posterior and even apical ones. In forms with significant lung damage and remodeling, cavitary wall exposure dictates drainage (34,37-39).

Musculocutaneous flaps are harvested and are then attached to the pleuropulmonary edges of the cavern after the resection of 2-3 costal segments and after the excision of the exposed thickened pleura. Careful ligation of the affected intercostal pedicles and careful hemostasis are practiced, given the risk of hemorrhage secondary to adhesions and local vascular hypertrophy.

The cavity is cleaned, removing the mycetoma and identifying the bronchial fistulas.

The complete excision of the exposed thickened pleura is performed while avoiding the creation of ‘pockets’, in order to have a maximum opening and exposure of the pulmonary cavity.

Subsequently, by daily dressing and cleaning of the cavernostoma, the granulation and epithelialization of the cavern will be stimulated. Sometimes, it is necessary to reopen the stoma due to its tendency of superficially closing. Nakada et al uses the Alexis wound retractor to avoid this issue (31). Bronchial fistulas may persist for a long time, but they eventually slowly close. The closure of the cavernostoma, a secondary therapeutic objective, can be performed surgically by myoplasty or can occur spontaneously by epithelialization (31,33,34,40,41).

Under optimal functional conditions, most authors indicate pulmonary resection as an elective treatment in invasive pulmonary aspergillosis. Cavernostomy, originally considered for tuberculosis lesions, was subsequently employed for patients with invasive pulmonary aspergillosis with borderline lung function, in whom the anesthetic-surgical risk was too high to perform lung resection.

Authors found that in the group with conservative drug treatment in symptomatic forms the results were poor, with a significant mortality rate at 12 months. Therefore, surgical treatment was imposed. It is unanimously accepted that in patients with absolute contraindication to surgery, parenteral treatment is not sufficient and it is recommended to inject intracavitary amphotericin, or saline solution, and if possible, draining the cavity under CT guidance. Complete or temporary remissions can be obtained (26).

Takahashi et al (42) presented an article of three case presentations, but all with acceptable lung function (which allowed a lung resection, i.e., FEV1 over 55%), but all on a postoperative background of neoplastic context. Patients had developed aspergillus forms on the remaining pleural cavities, probably air contaminated postoperatively by parenchymal or bronchial air fistulas.

The major element of clinics that imposed a cavernostomy were small-mild, recurrent hemoptysis, less often a massive episode (30-33,38-43).

Concerning surgical timing, Gebitekin et al (44) and Da Silva et al (36) performed the intervention in conditions of massive hemoptysis, but it is preferable to perform the intervention in chronic conditions, if possible, after bronchial artery embolization or after medical treatment with traxemic acid. Rergkliang et al did the cavernostomy for massive hemoptysis, but without having a preoperative pulmonary functional evaluation (44,45).

Cavernostomy is performed where the lesion is closest to the chest wall. The place of incision is the axillary area in most cases, but there was also one case in which the anterior area on the right medioclavicular line was the elected incision area.

In our group, out of 4 surgical procedures, 3 cavernostomies were performed in the right axillary area and one interscapuleovertebral on the left hemithorax after resection of the posterior rib arches 3 and 4. The procedure itself is guided by the peripheral area of the cavern, usually associated with lesions of the posterior and apical segments. The approach is limited in the scapular area if there is an exact overlap.

It is preferable to locate via guidance the peripheral contact area of the cave under a computed tomography or radioscopic.

The procedure is performed in a single stage under general anesthesia. Performing the procedure under local or regional anesthesia constitutes an exception. Gebitekin et al (44) simultaneously mobilized muscle flaps to fill the cavity. This option should be maintained if there are no major bronchial fistulas. Large flap muscles of the pectoralis major, serratus anterior or latissimus dorsi muscles can be used depending on the topography of the cavern. Shirahashi et al (46) reported a case of two-stage operation with omentopexy following cavernostomy, for lung abscess arising in the residual lung after bilobectomy.

The procedure may also involve mobilization of muscle flaps for filling the remaining cavity, but usually these should be avoided until the area is granulated and the fistulas have shrunk or even closed. It can be carried out later, after the closure of the bronchial fistulas or partially to favor the closure of the fistulas in case of reintervention for the reopening of the stoma. Regnard et al (47) and Sagawa et al (48) mentioned reinterventions to reopen the superficially closed stoma to restore communication.

Postoperatively, the authors mention the dressing of the cavernostoma with gauzes soaked with amphotericin B; however, daily dressing and cleaning the cavernostoma with sterile gauzes is sufficient, abolishing the favorable conditions for fungus development. Systemic antifungal treatment is recommended to precede the intervention by 2 weeks and to follow it for up to 3 months.

Many authors reported a mortality rate higher than that seen with pulmonary resection, but that is because the patients eligible for cavernostomy have a poor general condition or impaired pulmonary function (41-49).

In a large study, Cesar et al (35) presented 111 cases subjected to cavernostomy for pulmonary aspergillosis associated with reduced lung function. The evolution of the patients was similar to the group in which lung resection was performed. The author found a higher rate of hemorrhagic complications, probably due to specific hypervascularization and recurrences, secondary to the tendency of superficial closure of the stoma or complete non-drainage of the aspergillary cavities (35).

Overall, the method of cavernostomy remains a good solution. It is effective and it can be performed in patients with complex fungal ball with peripheral location, with permanently or temporarily impaired pulmonary function. In stable patients without active hemoptysis, it demonstrated to be an easy-to-perform and low-risk procedure.

In conclusion, lung resection techniques for invasive pulmonary aspergillosis are of choice if lung function allows for it and there are no other contraindications. The high rate of mortality of lung aspergillosis with poor ventilator function despite medical treatment and arterial embolization demand a solution with minimal impact. Thus, cavernostomy should remain an option in selected cases that do not allow large-scale resections or an additional functional decrease.