Visceral disseminated varicella zoster virus infection with brachial plexus neuritis detected by fluorodeoxyglucose positron emission tomography and computed tomography.

Varicella zoster virus (VZV) infection sometimes result in visceral disseminated VZV infection (VD-VZV), which is a fulminant disease featured by abdominal pain and the absence of skin lesions, particularly occurs in the immunosuppressive patients. Brachial plexus neuritis (BPN) is another rare type of VZV infection usually appears without blisters. Few diagnostic images of both VD-VZV and BPN-VZV have been reported. A 25-year-old woman receiving allogeneic hematopoietic stem cell transplantation (HSCT) for acute myeloid leukemia. Unexplained severe pain in the left upper extremity followed by severe stomachache, liver dysfunction and unconsciousness appeared on day 344 post-HSCT. Computed tomography (CT) showed left brachial plexus hypertrophy and edematous changes to the hepatoduodenal ligament, fluorodeoxyglucose positron emission tomography (FDG-PET) showed increased uptake in both lesions. Intravenous acyclovir therapy was started and successfully resolved all symptoms. Several days later, blisters appeared all over the body and positive VZV DNA from blood using polymerase chain reaction test was obtained. FDG-PET and CT may offer supportive findings for detecting or diagnosing blister-less VZV infectious diseases.