Right hypochondriac pain. Any suggestion.

A 40-year-old woman experienced acute onset of pain at the right hypochondriac area, that is aggravated with deep breathing. She had no other symptoms. 

The right hypochondrium was mildly tender. Abdominal ultrasound examination was normal.

Her biochemistry was completely normal, although serum D-dimer level was markedly elevated.

Doppler study of lower limb vessels was normal. 

Chest X-Ray film was normal as well as CT pulmonary angiography, but abdominal CT showed relatively dense liver capsule.

Any suggestion?