PMC9479653_01
Polymorphic population of lymphocytes and histiocytes, with squamoid cells (yellow arrows in a and b). A: PAP stain x10; (b) PAP stain x100; (c) Higher magnification of histiocytes and polymorphic lymphocytes (red arrowhead- lymphoblast, green arrowhead- small lymphocytes) (Diff Quick stain x100); (d) Polymorphic population of small lymphocytes (red arrowhead- lymphoblast, green arrowhead- lymphocytes) (PAP stain x100).
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Fine needle aspiration (FNA) revealed polymorphic lymphocytes without Hurthle cells [Figure 1a-d]. Furthermore, evaluation of the aspirate smear showed occasional aggregates of squamoid cells consistent with Hassall corpuscles [Figure 1].
The lymphocytes were immunoreactive for TdT and nonimmunoreactive for CD34 (a and b, x40, immunohistochemistry on cell-block sections).
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