Parathyroid gland
Atypical adenoma

Topic Completed: 1 January 2013

Minor changes: 27 April 2020

Copyright: 2003-2019,, Inc.

PubMed Search: Atypical adenoma parathyroid full text[sb]

Monika Roychowdhury, M.D.
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Cite this page: Roychowdhury M. Atypical adenoma. website. Accessed May 28th, 2020.
Clinical features
  • Has some features of malignancy (broad fibrous bands crossing the tumor, trabecular growth, pseudocapsular invasion [clusters of parathyroid cells trapped within the capsule in 50%]) but no vascular invasion, no metastases, rarely increased mitotic activity (Hum Pathol 2003;34:54)
  • Unpredictable clinical behavior
Case reports
Microscopic (histologic) images

Images hosted on other servers:

Atypical adenoma
showing characteristic
dense collagenous bands

Atypical adenoma extending close to margins of excision, often due to fibrosis and adherence to adjacent structures

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