A bronchial mucoid impaction is an accumulation of mucus within a bronchus that is not obstructed. If the mucoid impaction is secondary to obstruction, then it is better termed a bronchocele.
(3) allergic bronchopulmonary aspergillosis or other hypersensitivity reaction to an inhaled allergen
(4) dehydration or low atmospheric humidity, with mucus excessively dry
If the affected bronchus is large enough then it can be seen as an opacity on a chest X-ray that may be tubular or branching. When radiating from the hilum the appearance is referred to as the “finger in glove”or “gloved finger” sign.
Involvement of a smaller bronchus may be detected on CT images.
Differential diagnosis:
(1) arteriovenous malformation
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