# Posttransplant Lymphoproliferative Disorder in a Patient With Alpha-1 Antitrypsin Deficiency: A Case Report

## TL;DR

A 13-year-old liver transplant patient with alpha-1 antitrypsin deficiency developed posttransplant lymphoproliferative disorder and was successfully treated with medication adjustments and rituximab.

## Contribution

This case report highlights the management of PTLD in a pediatric patient with AATD long after a liver transplant.

## Key findings

- The patient was diagnosed with PTLD and treated by reducing and stopping tacrolimus, then restarting at a lower dose.
- The patient received ganciclovir, prednisone, and rituximab, which stabilized his Epstein-Barr-virus viral load.
- The case emphasizes the importance of considering PTLD in post-transplant patients with AATD.

## Abstract

A 13-year-old male with a past medical history of receiving a whole liver transplant secondary to alpha-1 antitrypsin deficiency (AATD) with subsequent inferior vena cava thrombosis nine years prior presented to the emergency department with abdominal distension, shortness of breath, coughing, and left superficial cervical lymphadenopathy. He had seen his pediatrician the day before where he tested negative for group A Streptococcus, influenza, and severe acute respiratory syndrome coronavirus 2. Additionally, the patient reported having elevated liver function tests noted from the results of lab tests taken earlier that day. The patient was admitted to the hospital. While at the hospital, a lymph node biopsy was performed, and pathology from that biopsy revealed infectious mononucleosis-like nondestructive posttransplant lymphoproliferative disorder (PTLD). Due to the patient's liver transplant nine years prior, the patient was on an immunosuppressant medication: tacrolimus 2 mg. To treat the PTLD, the tacrolimus was reduced, then stopped, and then subsequently restarted at 1 mg. He also was given ganciclovir and prednisone. Two months after recovering from the PTLD, the patient’s Epstein-Barr-virus (EBV) viral load continued to fluctuate, and he was treated with three doses of the monoclonal antibody drug rituximab. After treatment with rituximab, his EBV viral load remained stable. This case report gives insight into the treatment of PTLD and can serve as a reminder to be aware of the possibility of PTLD in a pediatric patient with AATD multiple years after a transplant.