case_images: PMC9019325_01
case_images: Computed tomography (CT) scan showing an osteolytic maxillary lesion located anterior to the inferior aspect of the left maxillary sinus.
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case_images: PMC9019325_01_10.1177_2050313X221091670-fig1.jpg
case_images: fig1-2050313X221091670
case_images: Computed tomography (CT) scan revealed a 3-cm-sized osteolytic maxillary lesion located anterior to the inferior aspect of the left maxillary sinus (Figure 1).
case_images: Cellular lesion with vague storiform pattern, hematoxylin and eosin, 100x (a). Sheets of plasma cells are characteristic, hematoxylin and eosin, 400x (b). The tumor infiltrates in between the bone trabeculae, hematoxylin and eosin, 100x (c). The spindle cells are positive for SMA immunohistochemical stain (d).
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case_images: PMC9019325_01_10.1177_2050313X221091670-fig2.jpg
case_images: fig2-2050313X221091670
case_images: Immunohistochemical staining revealed that the spindle cells were positive for smooth muscle actin (Figure 2).
case_images: Polyclonal kappa-positive (a) and lambda-positive (b) plasma cell population. The lymphocytes are of mixed CD3-positive (c) and CD20-positive (d) cell population.
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case_images: PMC9019325_01_10.1177_2050313X221091670-fig3.jpg
case_images: fig3-2050313X221091670
case_images: CD3 and CD20 stainings revealed a mixed-lymphocyte population (Figure 3).
case_images: The partial maxillectomy specimen.
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case_images: The patient underwent partial maxillectomy (Figure 4), and there was no evidence of recurrence during the 4-month follow-up period.