lung: gallium imaging

scans at 48 hrs because 50% of normals show activity at 24 hrs
focal uptake
- primary pulmonary malignancy
- benign disorder: granuloma, abscess, pneumonia, silicosis
multifocal/diffuse uptake
- infection
  - TB: active lesion, miliary TB, rapidly progressive TB pneumonia
  - PCP: unimpressive symptoms and CXR
  - CMV
- inflammation: sarcoid, interstitial lung disease (pneumoconiosis, IPF, lymphangitic carcinomatosis), radiation pneumonitis
- drugs: bleomycin, amiodarone
- contrast lymphangiography (in 50%)

Yong H. Hahn, MD - 27 July 1995
Last updated: 1 October 2013