Aspergillus disease has a wide spectrum of manifestations within the lungs; however invasive Aspergillus is most commonly associated with immunocompromise or preexisting respiratory disease. Here we present a case of Aspergillus tracheobronchitis causing right middle lobe collapse, masquerading as late-onset asthma in a patient with no pre-existing risk factors following massive inhalation of Aspergillus spores from working with compost. This case highlights the importance of having a high index of suspicion for Aspergillus-related disease even in those with no traditional risk factors.
KEYWORDS: Aspergillus tracheobronchitis, immunocompetent, invasive Aspergillus, spore inhalation
Case reportA 67-year-old man was referred to respiratory outpatients with a nine-month history of breathlessness, wheeze and cough productive of light-brown tenacious sputum plugs. He had no significant past medical history. In the previous spring, while turning a pile of dry compost he had aspirated a significant amount of the resultant dust. That evening he became breathlessness, however this resolved after a few hours.The following week, while moving a pile of decaying weeds to the compost, he once again became breathless. This recurred a month later after disposing of weeds into the compost again, with an additional cough on this occasion. His symptoms now persisted, with progressive dyspnoea, cough and occasional wheeze.Following pulmonary function tests and initial review in the clinic, asthma was suspected, however the prescribed inhaled corticosteroid and short acting β2-agonist had little effect on his symptoms. A chest radiograph at this time was normal. His breathlessness increased and when he was seen in respiratory clinic he was struggling to walk 30 yards. He was expectorating brown cylindrical mucus plugs. Examination in clinic was consistent with right lower lobe collapse and oxygen saturations were 91% on air. A chest radiograph in the clinic revealed right middle and lower lobe collapse (Fig 1) and a sputum sample grew Aspergillus fumigatus. A computed tomography of the patient's chest, abdomen and pelvis showed occlusion of the bronchus intermedius with soft tissue. There was no evidence of a mass lesion (Fig 2). Blood tests are shown in Table 1. Peripheral eosinophils were raised, as were total immunoglobulin (Ig) E, IgE to Aspergillus and IgG to Aspergillus.Flexible bronchoscopy was performed, demonstrating a substantial, thick mucus plug in the bronchus intermedius (Fig 3). This was aspirated and a broncho-alvelolar lavage was undertaken. Endobronchial biopsies showed significant eosinophilia and there was no evidence of malignancy. Microscopy of the mucus plug showed branching Aspergillus hyphae (Fig 3) and Aspergillus fumigatus complex was cultured which was sensitive to voriconazole and itraconazole.The patient was seen by the respiratory physiotherapists to teach sputum clearance techniques which led to partial reinflation of the right lower lobe; however this was not maintained so he was commenced on oral pr...