*Excision provides definitive diagnosis and cure. *Biopsy provides a definitive diagnosis with less surgical risk. *Observation provides minimal risk from the intervention, but carries some risk of bleeding or infection of the<unk>  at a later time, making excision more difficult if it occurs.
Bronchogenic cyst
Bronchial leiomyoma
Bronchocele
Colloid cyst
Pancoast tumor
Peritonsillar abscess
Bronchopleural fistula
Pneumosinus dilatans