Shifting of upper border of liver dullness :

To delineate the upper border of liver dullness, you should percuss the anterior chest wall along right MCL from above downwards. Normally the upper border of liver dullness is present in right 5th ICS at MCL
Lowered or obliterated  of liver dullness is noted in 

• Emphysema.
• Pneumothorax (right sided).
• Perforation of abdominal hollow vtscus e.g. perforation of peptic ulcer.
• Cirrhosis of liver (liver becomes small).
• Visceroptosis of liver.

Elevated liverdullness :

• Amoebic or pyogenic liver abscess.
• Subdiaphragmatie abscess (right).
• Pleural effusion (right).
• Basal pneumonia (right).
• Increased intraabdominal tension due to ascites or pregnancy.

The upper border of liver dullness is present in right 7th and 9th ICS when percussed along
midaxillary and scapular line respectively.