<unk> s are small, solitary<unk> s or sinuses, most typically located in the region of the suprasternal notch or behind the manubrium.
Bronchogenic cyst
Bronchial leiomyoma
Bronchocele
Colloid cyst
Pancoast tumor
Peritonsillar abscess
Bronchopleural fistula
Pneumosinus dilatans