Histological changes in the hypofunctional pituitary gland following conventional radiotherapy for adenoma.

Abstract:

AIMS:Although delayed hypopituitarism is a common complication of conventional radiotherapy of sellar tumours, histological changes that may account for it have been rarely reported. To elucidate the changes, hypofunctional pituitary glands following irradiation were studied. METHODS AND RESULTS:Two pituitary glands obtained at autopsy from patients who had been irradiated for adenoma and exhibited hypopituitarism were examined. In both cases diffuse fibrosis was observed in the adenohypophysis, whereas the neurohypophysis remained unchanged. Immunohistochemistry showed that stellate-shaped S100 protein-positive cells were increased in number and distributed among the endocrine cells. Some irradiated endocrine cells showed dense granular immunoreactivity for mitochondrial protein, cytochrome oxidase and manganese-superoxide dismutase. In addition to faint reactivity with anti-cytokeratin 8, 18 antibody, many cells were densely positive with anti-cytokeratin 1, 5, 10, 14 antibody. CONCLUSIONS:These results indicate that radiation- induced fibrosis is associated with an increased number of folliculo-stellate cells and the presence of metabolic dysfunctional mitochondria resembling mitochondria in oncocytes. Squamous metaplasia in the irradiated endocrine cells was also noted. Various intracellular changes may participate in delayed pituitary hypofunction following radiotherapy.

journal_name

Histopathology

journal_title

Histopathology

authors

Nishioka H,Ito H,Haraoka J,Hirano A

doi

10.1046/j.1365-2559.2001.01132.x

keywords:

subject

Has Abstract

pub_date

2001-06-01 00:00:00

pages

561-6

issue

6

eissn

0309-0167

issn

1365-2559

pii

his1132

journal_volume

38

pub_type

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