Quantitative PET and Histology of Brain Biopsy Reveal Lack of Selective Pittsburgh Compound-B Binding to Intracerebral Amyloidoma

J Alzheimers Dis. 2018;65(1):71-77. doi: 10.3233/JAD-180316.


This single case study examines selective Pittsburgh compound-B (PiB) binding to an intracerebral light-chain amyloidoma using a 90-minute dynamic [11C]PiB-PET scan and brain biopsy tissue. Parametric non-displaceable binding potential (BPND) images showed low specific binding in the amyloidoma (BPND = 0.23), while relative tracer delivery was adequate (R1 = 0.44). Histology of the tissue revealed strong coloring with Congo-red, thioflavin-S, and X-34, indicating presence of amyloid. However, immunological staining with 6F/3D revealed absence of amyloid-β and histofluorescence of 6-CN-PiB, a highly fluorescent derivative of PiB, was at background levels. Our results suggest that PiB does not detect the atypical amyloid pathology associated with an intracerebral light-chain amyloidoma. These findings are of interest to clinicians and researchers applying [11C]PiB-PET to detect atypical forms of amyloid pathology.

Keywords: Amyloid; case study; histology; positron emission tomography.

Publication types

  • Case Reports
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Amyloidosis / diagnostic imaging*
  • Aniline Compounds / metabolism*
  • Biopsy
  • Brain / diagnostic imaging*
  • Female
  • Humans
  • Magnetic Resonance Imaging
  • Middle Aged
  • Positron-Emission Tomography*
  • Seizures / diagnostic imaging*
  • Thiazoles / metabolism*


  • 2-(4'-(methylamino)phenyl)-6-hydroxybenzothiazole
  • Aniline Compounds
  • Thiazoles