PMC9149486_01
US of the axilla. a A round lymph node showed very low internal echoes (asterisk) and slightly enhanced posterior echoes (arrow). b A larger lymph node had eccentric cortical hypertrophy and distinct lymph node hilum in a convex fashion (arrow).
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F1
Ultrasonography (US) showed two swollen lymph nodes, oval and round lymph nodes with or without lymph node hilum, of 27 mm and 14 mm in size, respectively (Fig. 1).
PET showed strong avidities in the axillary lymph nodes (arrow) with maximum standardized uptake value of 7.0. PET, positron emission tomography.
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F2
Positron emission tomography showed a maximum standardized uptake value of 7.0 in the swollen lymph nodes without any other avidities (Fig. 2).
Pathological findings. a Low magnified view of the resected tissue showed follicular hyperplasia (asterisks), microglanulomas (arrowheads), tingible body macrophages (arrows), monocytoid B cells (square), and no giant cells. b Magnified view showed microgranulomas (arrowheads) consisting of epithelioid cells. c Tingible body macrophages (arrows) were found in the irregularly dilated germinal center. d Aggregation of monocytoid B cells (square) with neutrophil interminglement (arrow) was observed in the dilated paracortex.
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F3
Irregularly dilated germinal center had microglanulomas, tingible body macrophages, enlarged aggregation of monocytoid B cells with neutrophil interminglement, and no giant cells, leading to the diagnosis of toxoplasmosis (Fig. 3).