Thyroid gland
Other malignancies
Plasmacytoma

Authors: Sheren Younes, M.D. (see Authors page)

Revised: 13 July 2016, last major update January 2015

Copyright: (c) 2016, PathologyOutlines.com, Inc.

PubMed Search: Plasmacytoma [title] thyroid
Definition / General
  • Rare tumor of thyroid gland, presenting as a mass
  • Solitary or associated with multiple myeloma
  • Diagnosis should be restricted to tumors without a lymphoid component
Case Reports
Gross Images

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Gray, firm, fleshy

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Thyroidectomy specimen

Micro Description
  • Dense infiltrate of plasma cells replacing thyroid follicles
  • Plasma cells often appear monotonous; may be mature, immature or anaplastic
  • Mature plasma cells: basophilic cytoplasm and clock face nucleus
  • Immature plasma cells: large irregular nuclei, less condensed chromatin and occasional nucleoli
  • Anaplastic plasma cells: significant variation of nuclear size, coarse to vesicular nuclei and prominent nucleoli
  • Also multinucleated cells, immunoglobulin inclusions (dutcher bodies or intracytoplasmic crystals)
Micro Images

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Case of the Week #394:

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CD79a

CD138

Kappa

Lambda



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Mature and
immature plasma cells

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H&E, CD138+

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Kappa light chain+
lambda light chain-

Cytology Description
  • Cellular; single cell infiltrates with basophilic cytoplasm containing paranuclear hof, round-oval nuclei with cart-wheel chromatin, variable pleomorphism, multinucleation
Cytology Images

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Intranuclear inclusion

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Congo red+

Positive Stains
Negative Stains
Differential Diagnosis