Kronig's Isthmus is a band of resonance representing lung apex. It may also be remembered as the supraclavicular region.
Boundaries: Medially: Scalene
Laterally: Acromion process
Anteriorly: Clavicle
Posteriorly: Trapezius
Impaired dullness: Fibrosis, Upper Lobe Collapse and Mass
Hyperresonant: Emphysema, Hydropneumothorax
Traube's Space boundaries:
Superiorly: 6th rib
Laterally: Mid axillary line
Medially: Left costal margin
Dullness: Splenomegaly, Full stomach, Left Pleural Effusion, Carcinoma involving gastric fundus, Enlarged left lobe of liver, Achalasia cardia