|Year : 2021 | Volume
| Issue : 1 | Page : 132-135
Pulmonary neurofibromatosis with bilateral bronchiectasis: A rare thoracic manifestation
Manoj Kumar Pandey1, Jyoti Bajpai2, Surya Kant2, Hemant Kumar1, Poornima Mishra3
1 Department of Respiratory Medicine, Ram Manohar Lohiya Institute of Medical Sciences, Lucknow, Uttar Pradesh, India
2 Department of Respiratory Medicine, King George's Medical University, Lucknow, Uttar Pradesh, India
3 Department of Pathology, T. S. M Medical College and Hospital, Lucknow, Uttar Pradesh, India
|Date of Submission||14-May-2020|
|Date of Decision||03-Jun-2020|
|Date of Acceptance||12-Aug-2020|
|Date of Web Publication||31-Jan-2021|
Prof. Surya Kant
Department of Respiratory Medicine, King George's Medical University, Lucknow, Uttar Pradesh
Source of Support: None, Conflict of Interest: None
Neurofibromatosis type 1 (NF1), also known as von Recklinghausen's disease, is an autosomal dominant genetic disorder. The incidence of NF is 1 in 3000 individuals. Approximately one-half of the cases are familial, while the remaining occur sporadically due to germ cell mutations. The clinical manifestation of NF1 may include a café-au-lait macule usually 5–15 mm in diameter, multiple neurofibromas, axillary or inguinal freckling, optic glioma, Lisch nodules, and a distinctive bony lesion. Although very rare, pulmonary manifestation in neurofibromatosis can occur in the form of mediastinal neurofibromas, pleural neurofibromas, tracheobronchial neurofibroma, interstitial lung disease, bullous lung disease, and cystic lung disease. Here, we present a rare case of pulmonary neurofibroma with bronchiectasis.
Keywords: Bronchiectasis, histopathological examination, kyphoscoliosis, neurofibroma
|How to cite this article:|
Pandey MK, Bajpai J, Kant S, Kumar H, Mishra P. Pulmonary neurofibromatosis with bilateral bronchiectasis: A rare thoracic manifestation. Indian J Respir Care 2021;10:132-5
|How to cite this URL:|
Pandey MK, Bajpai J, Kant S, Kumar H, Mishra P. Pulmonary neurofibromatosis with bilateral bronchiectasis: A rare thoracic manifestation. Indian J Respir Care [serial online] 2021 [cited 2021 Mar 2];10:132-5. Available from: http://www.ijrc.in/text.asp?2021/10/1/132/308455
| Introduction|| |
Neurofibromatosis, which was first described in 1882 by von Recklinghausen, is an autosomal dominant genetic disorder with an incidence of approximately 1 in 2600–3000 individuals. About half of the cases are inherited, while the remaining occur sporadically due to germ cell mutations. Neurofibromatosis type 1 (NF1) affects males and females equally and affects individuals of all racial and ethnic backgrounds.
The clinical manifestation of NF1 may include a café-au-lait macule usually 5–15 mm in diameter, multiple neurofibromas, axillary or inguinal freckling, optic glioma, Lisch nodules, and a distinctive bony lesion. Although very rare, thoracic manifestation in neurofibromatosis can occur in the form of scoliosis, kyphoscoliosis, mediastinal neurofibromas, pleural neurofibroma, interstitial lung disease, cystic lung disease, and bullous lung disease. NF1-related lung disease is a rare but increasingly recognized, high morbidity-associated condition. Scarce data exist regarding the prevalence, clinical characteristics, and pathophysiology of NF1-related pulmonary disease. NF1 may involve lung in the form of bullae, cysts, emphysema, bibasilar reticular opacities, interstitial fibrosis, and/or ground-glass opacities. The relationship between smoking and NF1-related lung disease is also unclear. Neurogenic tumor (neurofibroma) of the lung is very rare. Only few cases have been reported in the literature. Here, we present a rare case of bilateral bronchiectasis with an incidental mass in a patient with von Recklinghausen's disease. The mass was later diagnosed to be a neurofibroma on histopathology.
| Case Report|| |
A 45-year-old ex-smoker male presented to our department with the complaints of breathlessness and cough with purulent expectoration for the past 6 months. The patient also had high-grade fever for the past 2 weeks. There was a history of repeated episodes of similar complaints in the past. He was prescribed several courses of antibiotics, resulting in some relief. On examination, he was febrile but hemodynamically stable. He was tachypneic, and his oxygen saturation was 92% on room air. There were multiple, soft, fleshy, sessile, nontender nodules all over the body surface, diagnosed as neurofibromas [Figure 1]. Kyphoscoliosis and diffuse coarse crackles were present on chest examination. There was absence of clubbing.
|Figure 1: Multiple, soft, fleshy, sessile, nontender nodules over the lateral chest wall|
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His laboratory investigations showed a hemoglobin of 12.1 g% and total white cell count of 12,000/mm3 (neutrophils: 68%, lymphocytes: 27%, and eosinophil 5%). Total serum IgE was 270 kU/l. Viral markers were negative. No acid-fast bacilli (AFB) were seen on sputum smear. GeneXpert for AFB was negative. Sputum smear for Gram stain was positive for Gram-negative bacilli. Sputum culture was positive for Pseudomonas aeruginosa and sensitive to piperacillin, amikacin, and ciprofloxacin. Spirometry revealed a restrictive pattern (postbronchodilator forced expiratory volume in 1 s/ forced vital capacity [FVC] 81% predicted and FVC 66% predicted).
The chest X-ray posteroanterior view showed heterogeneous opacity in the left upper zone and right paracardiac region [Figure 2]. High-resolution computed tomography (HRCT) of the thorax with contrast revealed bilateral cystic bronchiectasis in both the lungs (bilateral apical and posterior segments of the lower lobe) and a heterogeneously enhancing mass lesion in the right lung posteriorly from pleural origin. A heterogeneous intrathoracic mass lesion on the left side abutting the arch of the aorta was also seen [Figure 3] and [Figure 4]. CT-guided biopsy from both the mass lesions showed cores of fibrocollagenous tissue, with tumor cells arranged in sheets and fascicles. The tumor cells were bipolar, spindle shaped with fibrillary cytoplasm and elongated wavy spindle-shaped nuclei. The tumor cells were found to be positive for S-100 and vimentin on immunohistochemistry, suggesting neurofibroma [Figure 5]. Based on clinical, radiological, and histopathological examination findings, a diagnosis of bilateral bronchiectasis and pulmonary neurofibroma was made. The patient was started on intravenous antibiotic infusion of piperacillin-tazobactam 4.5 g QID and oral azithromycin 500 mg OD for 7 days. His fever started regressing from day 2, and he was afebrile thereafter. The patient was continued for 1 week with the in-hospital antibiotic regimen. At discharge, the patient was prescribed oral azithromycin in a single daily dose for the next 5 days. The patient was relieved of his symptoms (cough and fever). He was referred to thoracic surgery for removal of the intrathoracic neurofibroma.
|Figure 2: Chest X-ray posteroanterior view showing heterogeneous opacity in the left upper zone and right paracardiac region|
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|Figure 3: High-resolution computed tomography thorax with contrast revealing bilateral cystic bronchiectasis|
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|Figure 4: Mediastinal window on computed tomography thorax showing a heterogeneously enhancing mass lesion in the posterior mediastinum|
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|Figure 5: Intrathoracic mass biopsy histopathological examination showing cores of fibrocollageneous tissue with a tumor arranged in sheets and fascicle. The tumor cells are bipolar, spindle shaped with fibrillary cytoplasm and elongated wavy spindle-shaped nuclei|
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| Discussion|| |
NF1 (von Recklinghausen's disease) is a genetic disease with involvement of multiple organs of neuroectodermal origin. This group of diseases is also known as phakomatoses, from the Greek 'phakos' meaning 'stigmatized at birth'. Neurofibromatosis is a benign tumor which consists of neurilemma cells and fibroblasts. The main symptoms concern skin, nervous system, bones, and eyes. The gene responsible for the development of NF1, known as NF1, is located on the long arm of the 17th chromosome, and encodes a protein known as neurofibromin. Thoracic manifestations of NF1 are varied and common such as chest wall neurofibroma, kyphoscoliosis, and ribbon-like rib deformity. However, the involvement of lung parenchyma in neurofibromatosis appears to be uncommon. Inactivation of the NF1 gene leads to a permanent stimulation of a cascade of signals and excessive cell division, leading to the formation of tumors. It can develop anywhere on the peripheral nerve, and can be seen most frequently on the trunk, lower extremity, head, and upper extremity, but less in the mediastinum and perineum. Respiratory neurofibromatosis is very uncommon.
Neurogenic tumors of the lung originate from the various nervous structures of the costovertebral recesses and less frequently from the pleuro-pulmonary nerves. Schwannoma (neurilemmoma) and neurofibroma are the most common mediastinal neurogenic tumors. Both these lesions are benign, slow-growing tumors. Most commonly, they appear as encapsulated and well-marginated masses found in the costovertebral sulci where they arise from the intercostal nerve rami. In the case of lung involvement, it can cause obstruction, chest deformities, airway and parenchymal neurogenic tumors, pulmonary fibrosis, cystic pulmonary diseases, primary pulmonary hypertension, central hypoventilation, and diaphragm paralysis.
Over one-third of patients with neurofibromas will have neurofibromatosis (von Recklinghausen's disease). These patients tend to present at an earlier age and may have café-au-lait spots, suggesting the diagnosis. Pleural neurofibromatosis arises from the intercostal nerve, manifests as chest distress and dyspnea on exertion. Langman et al. reported two cases of pleural neurofibroma. Surgical resection is the definitive treatment for these benign nerve sheath tumors, commonly performed through video-assisted thoracoscopic surgery with favorable results. Surgery for mediastinal mass, which has been diagnosed as neurofibroma is done only if it causes compression or quite large.
A literature search revealed that the coexistence of bronchiectasis and pulmonary neurofibroma is rarely seen in neurofibromatosis. However, sporadic case reports of pulmonary manifestations due to neurofibromatosis do exist. The first published article of neurofibromatosis-induced pulmonary manifestations was in 1963 when Davies reported a case of neurofibromatosis and interstitial lung disease. The exact prevalence and reason for its association is still unclear.
Zamora et al.'s case series and literature review based on CT morphology combined with extra-pulmonary manifestation suggested that neurofibromatosis with diffuse lung disease is a distinct clinical entity, characterized by upper-lobe cystic, bullous disease, emphysema, basilar fibrosis, and ground-glass opacity. HRCT findings revealed emphysema (25%), cyst (25%), ground-glass abnormality (37%), bullae (50%), and reticular abnormalities (50%) in patients with neurofibromatosis [Table 1].
|Table 1: Prevalence of different lung diseases in neurofibromatosis,|
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Bronchiectasis is defined as abnormal, persistent bronchial dilatation, usually associated with inflammation in the bronchial tree and lung parenchyma. The close differential diagnosis for this could be cystic fibrosis, allergic bronchopulmonary aspergillosis, nontubercular mycobacteria infection, primary ciliary dysfunction, common variable immunodeficiency, postinfection, etc. Pulmonary cyst is an air-filled lucency or low-attenuating area bordered by a thin wall (usually <2 mm) and having a well-defined interface with normal lung tissue. The differences between bronchiectasis and lung cysts are given in [Table 2].
However, our patient had predominantly lower lobe-involvement bronchiectasis. In most of the case series and observational studies of neurofibromatosis, the pulmonary cyst was seen in the upper lobe of the lung. However, bronchiectasis has not been described. This case is unique because our patient presented with bilateral cystic bronchiectasis, kyphoscoliosis, and multiple skin neurofibromas with pulmonary neurofibroma.
| Conclusion|| |
Patients with neurofibromatosis and respiratory symptoms need to be checked for possible changes in the lung parenchyma, and they require a multidisciplinary approach. A few studies showed upper and lobe cystic and bullous disease and basilar fibrosis unlike our patient who had predominantly lower-lobe bronchiectasis with bilateral pulmonary neurofibroma as a phenomenal thoracic presentation of neurofibromatosis.
Declaration of patient consent
The authors have certified that they have obtained all appropriate patient consent forms. In the form, the patient has given his consent for his images and other clinical information to be reported in the journal. The patient understands that his name and initial will not be published, and due efforts will be made to conceal his identity, but anonymity cannot be guaranteed.
Financial support and sponsorship
Conflicts of interest
There are no conflicts of interest.
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[Figure 1], [Figure 2], [Figure 3], [Figure 4], [Figure 5]
[Table 1], [Table 2]