Parathyroid gland
Neoplasms
Atypical adenoma


Topic Completed: 1 January 2013

Revised: 7 May 2019

Copyright: 2003-2019, PathologyOutlines.com, Inc.

PubMed Search: Atypical adenoma parathyroid full text[sb]

Monika Roychowdhury, M.D.
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Cite this page: Roychowdhury M. Atypical adenoma. PathologyOutlines.com website. http://www.pathologyoutlines.com/topic/parathyroidatypicaladenoma.html. Accessed October 18th, 2019.
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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