Diagnostic features of allergic bronchopulmonary aspergillosis (ABPA) include
ABPA is a distinct diagnosis from simple asthma, characterized by prominent peripheral eosinophilia and elevated circulating levels of IgE (>417 IU/mL). Establishing a diagnosis of ABPA also requires establishing sensitivity to Aspergillus antigens by skin test reactivity, positive serum precipitins for Aspergillus, and/or direct measurement of circulating specific IgG and IgE to Aspergillus. Central bronchiectasis is described as a classic finding on chest imaging in ABPA but is not necessary for making a diagnosis. Other possible findings on chest imaging include patchy infiltrates and evidence of mucus impaction. Ref Harrison 19th edition pg 1686
Changing pulmonary infiltrates
Peripheral eosinophilia
Serum precipitins against aspergillosis fumigants
Occurance in patients with old cavitatory lesions
Respiratory system