The Annals of Thoracic Surgery, Vol 47, 741-745, Copyright © 1989 by The Society of Thoracic Surgeons
True thymic hyperplasia: a clinicopathological study
C Ricci, E Pescarmona, EA Rendina, F Venuta, LP Ruco and CD Baroni
Department of Thoracic Surgery, University of Rome La Sapienza, Italy.
In this report, we describe the clinicopathological features of 4 patients
with true thymic hyperplasia. This controversial thymic lesion has only
recently been defined as a variable, often massive enlargement of the
thymus characterized by a nearly normal microscopic structure. Our study of
4 patients and review of the literature indicate that true thymic
hyperplasia has a well-defined clinicopathological profile: prevalence in
children or young male patients, absence of associated autoimmune diseases,
and often presence of respiratory distress or peripheral blood
lymphocytosis, or both. True thymic hyperplasia should be considered in the
differential diagnosis of anterior mediastinal masses in children and young
adolescents.