<abstract xmlns="http://www.w3.org/1999/xhtml">

<sec><h3>Background</h3>
<p>Langerhans cell histiocytosis (LCH) is a rare disease characterized by the various systems involved and clinical manifestations with a wide range of symptoms.</p>
</sec>
<sec><h3>Objectives</h3>
<p>To describe clinical characteristics, imaging, treatment, and outcomes of pediatric LCH at Phramongkutklao Hospital, Bangkok, Thailand.</p>
</sec>
<sec><h3>Methods</h3>
<p>We conducted a 20-year retrospective review of the medical records of patients diagnosed with LCH from birth to 21 years old from January 1, 1997, to December 31, 2016.</p>
</sec>
<sec><h3>Results</h3>
<p>In all, 14 patients with median age of 2.5 years were studied. Six (43%) patients had single-system (SS) LCH. Five patients (63%) with multisystem (MS) LCH (n = 8. 57%) had risk-organ involvement (RO+). All patients had plain X-ray imaging of their skull with 11 (79%) showing abnormal findings. Tc-99m bone imaging and fluorodeoxyglucose F18 (FDG) positron emission tomography (PET)-computed tomography (CT) demonstrated abnormal findings in 8 (89%) and 4 (29%) patients, respectively. The 5-year event-free survival (EFS) for patients with RO+ MS-LCH was less than that for those without risk-organ involvement (RO−) MS-LCH and SS-LCH (20% vs. 100%, <italic>P</italic> = 0.005). Hematological dysfunction, hypoalbuminemia, and conjugated hyperbilirubinemia may be worse prognostic factors for RO+ MS-LCH.</p>
</sec>
<sec><h3>Conclusion</h3>
<p>FDG-PET-CT might have a greater accuracy to detect LCH disease than conventional plain X-ray and Tc-99m bone imaging. RO+ MS-LCH has been encountered with relapse and poor outcomes. Hematopoietic involvement, hypoalbuminemia, and conjugated hyperbilirubinemia may be worse prognostic factors for RO+ MS-LCH.</p>
</sec>
</abstract>

Background
Langerhans cell histiocytosis (LCH) is a rare disease characterized by the various systems involved and clinical manifestations with a wide range of symptoms.

Objectives
To describe clinical characteristics, imaging, treatment, and outcomes of pediatric LCH at Phramongkutklao Hospital, Bangkok, Thailand.

Methods
We conducted a 20-year retrospective review of the medical records of patients diagnosed with LCH from birth to 21 years old from January 1, 1997, to December 31, 2016.

Results
In all, 14 patients with median age of 2.5 years were studied. Six (43%) patients had single-system (SS) LCH. Five patients (63%) with multisystem (MS) LCH (n = 8. 57%) had risk-organ involvement (RO+). All patients had plain X-ray imaging of their skull with 11 (79%) showing abnormal findings. Tc-99m bone imaging and fluorodeoxyglucose F18 (FDG) positron emission tomography (PET)-computed tomography (CT) demonstrated abnormal findings in 8 (89%) and 4 (29%) patients, respectively. The 5-year event-free survival (EFS) for patients with RO+ MS-LCH was less than that for those without risk-organ involvement (RO−) MS-LCH and SS-LCH (20% vs. 100%, P = 0.005). Hematological dysfunction, hypoalbuminemia, and conjugated hyperbilirubinemia may be worse prognostic factors for RO+ MS-LCH.

Conclusion
FDG-PET-CT might have a greater accuracy to detect LCH disease than conventional plain X-ray and Tc-99m bone imaging. RO+ MS-LCH has been encountered with relapse and poor outcomes. Hematopoietic involvement, hypoalbuminemia, and conjugated hyperbilirubinemia may be worse prognostic factors for RO+ MS-LCH.

Clinical characteristics and outcomes of Langerhans cell histiocytosis at a single institution in Thailand: a 20-year retrospective study

Department of Radiology and Imaging Science, Riley Hospital for Children

Division of Hematology–Oncology, Department of Pediatrics

Asian Biomedicine

This work is licensed under the Creative Commons Attribution 4.0 International License.

Background
Langerhans cell histiocytosis (LCH) is a rare disease characterized by the various systems involved and clinical manifestations with a wide range of...

Clinical characteristics and outcomes of Langerhans cell histiocytosis at a single institution in Thailand: a 20-year retrospective study

Article Category: Original article

Published Online: Aug 20, 2021

Page range: 171 - 181

DOI: https://doi.org/10.2478/abm-2021-0022

Keywords
fluorodeoxyglucose F18, hyperbilirubinemia, conjugated, hematopoietic, hypoalbuminemia, organs at risk, positron emission tomography computed tomography

© 2021 Ponrachet Kitticharoenjit et al., published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.

Clinical characteristics and outcomes of Langerhans cell histiocytosis at a single institution in Thailand: a 20-year retrospective study

Article Category: Original article

Published Online: Aug 20, 2021

Page range: 171 - 181

DOI: https://doi.org/10.2478/abm-2021-0022

Keywordsfluorodeoxyglucose F18, hyperbilirubinemia, conjugated, hematopoietic, hypoalbuminemia, organs at risk, positron emission tomography computed tomography

© 2021 Ponrachet Kitticharoenjit et al., published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.

Keywords
fluorodeoxyglucose F18, hyperbilirubinemia, conjugated, hematopoietic, hypoalbuminemia, organs at risk, positron emission tomography computed tomography