Lymph nodes & spleen, nonlymphoma

Ectopic tissue / inclusions

Salivary gland

Last author update: 1 July 2014
Last staff update: 29 July 2022

Copyright: 2003-2023,, Inc.

PubMed Search: Salivary gland inclusions [title]

Jayalakshmi Balakrishna, M.D.
Page views in 2022: 1,055
Page views in 2023 to date: 76
Cite this page: Balakrishna J, Sharabi A. Salivary gland. website. Accessed February 7th, 2023.
Definition / general
  • Benign salivary gland structures in lymph nodes
  • Includes ducts and acini
  • Salivary gland inclusions
  • Ectopic salivary tissue
  • Heterotropic salivary gland tissue
  • Common incidental finding
  • Most common in upper cervical lymph nodes
  • Rarely - thoracic, mediastinal lymph nodes
  • Considered a normal event related to the embryology of the region
Clinical features
  • None - incidental finding
  • Enlarged lymph nodes
Prognostic factors
  • Benign with no significance
  • May undergo diseases of salivary glands including neoplastic processes - Warthin tumor is most common tumor
Case reports
  • Usually none, but may be indicated based on clinical situation
Clinical images

Images hosted on other servers:

Circumscribed mass lesions due to
sialometaplasia arising in ectopic
salivary gland ductal inclusions

Gross description
  • Normal / enlarged lymph nodes
Microscopic (histologic) description
  • Both ducts and acini are usually present
  • Benign ducts are lined by double layer of epithelium and myoepithelium
  • Benign acini have zymogen granules
Microscopic (histologic) images

AFIP images
Missing Image

Salivary gland inclusion in lymph node

Images hosted on other servers:

Inclusions undergoing sialometaplasia show extensive squamous metaplasia

Inclusions with sialometaplasia: SMA

Differential diagnosis
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