A growth hormone-secreting adenoma with incomplete nerve bundle formation

Neuropathology : Official Journal of the Japanese Society of Neuropathology
Hidetoshi Ikeda, Shinobu Takayasu

Abstract

We present a unique case of an adenoma secreting growth hormone (GH), showing incomplete nerve bundle formation without ganglion cells. A 47-year-old man presenting with acromegaly was revealed to have high serum GH and IGF-1 levels. The concentrations of the other adenohypophysial hormones were within the normal range. Histology revealed an unusual pituitary adenoma containing many nerve bundle-like structures. Adenoma cells with ovoid or round hyperchromatic nuclei and eosinophilic cytoplasms lacked the typical features of ganglion cells. The nerve bundles consisted of slender elongated cells. These fibers were arranged into groups in a roughly parallel fashion. By immunohistochemistry, many adenoma cells were positive for GH, prolactin, thyrotropin beta, synaptophysin and chromogranin. Fibrous bodies revealed by keratin immunostaining were found only in adenoma cells. Scattered star-shaped adenoma cells showed the same immunoreactivity as folliculo-satellite cells. Adenoma cells, but not the bundle-like structures, were also positive for Pit-1. Immunostaining for neurofilament protein, GFAP, vimentin, and S-100 protein revealed variable amounts of fibrils within the bundle-like structures. Scattered immunoreactivity for myel...Continue Reading

References

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Citations

Jan 13, 2017·The American Journal of Surgical Pathology·M Beatriz S LopesJulie Polder
Jun 25, 2019·Journal of Neuropathology and Experimental Neurology·Layla A AbushamatBette K Kleinschmidt-DeMasters

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