18027 Reactivation of latent VZV, a common infection caused by the extensive immunosuppression associated with HSCT, can lead to significant morbidity and mortality. The reported incidence of reactivation ranges from 23–67%. Most patients reactivate with cutaneous disease; mortality in pediatric patients is low in this setting. Isolated visceral zoster is rare and can be difficult to diagnose, presenting with ileus/abdominal pain, hepatitis and/or hyponatremia. We present 2 cases of visceral VZV in adolescents with cGVHD following unrelated donor HSCT. A 20 y.o, 11 months post-HSCT for Ph+ ALL was diagnosed with skin and hepatic cGVHD and began on prednisone 4 weeks before developing severe abdominal pain and constipation. A CT scan raised the possibility of intestinal obstruction. Concurrently, her Na+ dropped and transaminases markedly increased. Exploratory laporotomy revealed no obstruction but hepatic nodules were noted and biopsied. Acyclovir was begun before pathology returned positive for VZV. The patient developed fulminant hepatitis and died 3 days later, 9 days after first symptoms. The 2nd patient was a 19 y.o, 7 months post-HSCT for induction failure AML. Off immunosuppression, she developed hepatic cGVHD and was placed on prednisone with clinical improvement. The following week she developed abdominal pain and constipation. 2 days later she presented with a generalized seizure, hyponatremia, and elevated liver enzymes. She was begun on acyclovir and initially improved. Subsequent blood and CSF PCRs were positive for VZV. She died of hepatic failure 53 days after her initial symptoms. Given VZV in the spinal fluid, we postulate that the previously unexplained associated hyponatremia represents direct CNS viral toxicity. The diagnosis of visceral zoster can be difficult. A high level of suspicion for VZV is necessary in patients with cGVHD who have abdominal pain and/or hepatitis and antiviral therapy should be started promptly. Patient Summary Time post HSCT at VZV diagnosis: Day +386 Day +255 Conditioning: Cyclophosphamide Cyclophosphamide Total Body Irradiation Total Body Irradiation GVHD Prophylaxis: Tacrolimus Cyclosporine Rapamycin Methotrexate Steroids GVHD Involvement: Skin, liver, oral Liver Immunosuppression: Prednisone (1mg/kg) Prednisone (1.5mg/kg) Cyclosporine Lowest Na+: 117 (mmol/L) 112 (mmol/L) Highest LFT: AST:14920 AST:2506 ALT:7060 ALT:3631 Time from symptoms to acyclovir Initiation: 7 days 5 days Outcome: Death from hepatic failure 9 days after first presenting Death from hepatic failure 53 days after first presenting No significant financial relationships to disclose.
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