Pulmonary Aspergilloma Management
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Direct answer
A ball of Aspergillus mycelia colonising a pre-existing lung cavity — in India most often an old tuberculosis cavity — is a pulmonary aspergilloma, and its presenting complaint is usually recurrent haemoptysis, which can be massive. Imaging shows a rounded intracavitary mass with an air crescent (Monod) sign that moves between supine and prone scans because the fungus ball is mobile and gravity-dependent. Management is layered: observation for asymptomatic patients, bronchial artery embolisation to control significant bleeding, and surgical excision (lobectomy) as definitive therapy for localised disease with recurrent or severe haemoptysis.
What you must remember
- Three clinical forms of aspergillosis: saprophytic colonisation (aspergilloma), allergic bronchopulmonary aspergillosis (asthma, eosinophilia, proximal bronchiectasis, immediate skin reactivity and IgE), and invasive aspergillosis (angioinvasion in neutropenia and transplant).
- The cavity is pre-existing: healed tuberculosis is the dominant Indian substrate; sarcoidosis, bronchiectasis, bullae and old infarcts are others.
- Haemoptysis is the presenting feature in the majority — from erosion of the hypertrophied systemic bronchial circulation supplying the cavity wall, not the pulmonary artery.
- Monod (air-crescent) sign on CT: a crescent of air between the fungus ball and cavity wall; the ball changes position on prone imaging — distinguishing it from a tumour, which does not move.
- The bleeding vessels are systemic (bronchial arteries at systemic pressure), explaining both volume of bleeding and the rationale for bronchial artery embolisation.
- Embolisation controls the acute bleed in the large majority but recurrence is common — it buys time and safety, it does not remove the ball.
- Definitive surgery — lobectomy — for recurrent significant haemoptysis, localised disease and adequate respiratory reserve; operative risk is real in fibrotic tubercular lungs (bleeding, prolonged air leak).
- Antifungals have a limited role in the simple aspergilloma; itraconazole is used in chronic cavitary pulmonary aspergillosis and perioperatively in selected complicated cases.
Choosing between embolisation and resection
A 48-year-old man with tuberculosis treated 15 years ago reports three episodes of blood-streaked sputum and then one frightening 100 mL bleed. CT shows a 4 cm thin-walled cavity in the left upper lobe containing a mobile soft-tissue ball with a crescent of air — the fungus ball sits dependently on the prone series. Serology (Aspergillus precipitins) and sputum culture support the diagnosis.
He is stable, so work-up proceeds electively. With disease localised to one lobe and adequate spirometry, he is a candidate for definitive lobectomy — but only after bronchial artery embolisation has occluded the hypertrophied feeding vessels, buying a cool elective window. Had tuberculosis destroyed both upper lobes with poor FEV1, surgery would be dangerous and futile: repeated embolisation, itraconazole for the chronic cavitary component, and counselling that each new bleed is an emergency.
The contrast case is the asymptomatic incidental fungus ball: many remain quiescent for years, so observation with advice to report bleeding is legitimate — prophylactic surgery in poor-reserve lungs causes more harm than the natural history.
Where students slip
The most common conceptual error is treating the fungus ball as the bleeding source; it is the cavity wall, fed by systemic bronchial arteries, that erodes — which is why the exam answer to "why embolise the bronchial artery for a lung lesion?" is systemic pressure, and why ligating pulmonary vessels would miss it. The second slip is offering antifungals as definitive therapy: drugs penetrate a fungus ball poorly and cannot sterilise a ball sitting free in a cavity. Third is the imaging trap: a lesion moving between supine and prone is a fungus ball; an immobile mural nodule in a thick-walled irregular cavity raises carcinoma. Finally, the same genus produces angioinvasive disease in neutropenia — a medical emergency, not a surgical one.
Frequently asked questions
What is the Monod sign?
An air crescent between a mobile intracavitary fungus ball and the cavity wall; the ball shifts with position on CT, distinguishing aspergilloma from a fixed tumour nodule.
In which cavity does an Indian patient usually harbour an aspergilloma?
A healed tuberculous cavity; sarcoidosis, bronchiectasis and bullae are other substrates, but old tuberculosis dominates the Indian differential.
Why does bronchial artery embolisation work for aspergilloma bleeding?
The eroded vessels supplying the cavity wall are hypertrophied systemic bronchial arteries at systemic pressure; occluding them halts the bleed without touching the fungus ball itself.
When is surgery indicated for aspergilloma?
Recurrent or massive haemoptysis with disease localised to one lobe and sufficient pulmonary reserve; lobectomy is definitive, ideally performed electively after embolisation has stabilised the patient.
Do antifungal drugs cure a pulmonary aspergilloma?
No — penetration into the ball is poor; itraconazole has a role in chronic cavitary aspergillosis and selected perioperative situations, but the ball itself is a surgical target or an observed bystander.
Which patients are managed conservatively?
Those with incidental, asymptomatic aspergillomas and those with bilateral disease or poor respiratory reserve, in whom operative risk outweighs the threat — with strict advice to report haemoptysis at once.