title: Severe combined immunodeficiency with thymic mast cell hyperplasia.
abstract: The autopsy finding on an infant with severe combined immunodeficiency was marked thymic mast cell hyperplasia. The clinical immune status showed a deficit in T (thymus derived) lymphocytes and low immunoglobulin levels. The autopsy showed the histologic pattern designated thymic alymphoplasia and a marked lack of development of the reticuloendothelial organs. The mast cell hyperplasia may be the result of an antigenic stimulus early in embryonic life and/or the result of mast cell differentiation at the expense of normal thymic lymphoid development caused by a genetic defect.
mesh_terms: D001344:Autopsy; D006801:Humans; D006965:Hyperplasia; D007153:Immunologic Deficiency Syndromes / Q000473:pathology*; D007231:Infant, Newborn; D007232:Infant, Newborn, Diseases / Q000473:pathology*; D008297:Male; D008407:Mast Cells / Q000473:pathology*; D013950:Thymus Gland / Q000473:pathology*