PMC9170507_01
CT showing a well-defined heterogeneously enhancing mass at the left paravertebral region with extension into left T7/8 neural foramina. (a)-(b) Axial view; (c) coronal view.
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fig1
Incidentally, there was a well-defined heterogeneously enhancing mass at the left paravertebral region (7.1 x 7.8 x 7.8 cm) with extension into left T7/8 neural foramina (Figure 1).
Nasopharyngeal mass biopsy. Hematoxylin and eosin staining ((a) original magnification x40) and immunohistochemical staining were positive for MUM-1 ((b) original magnification x40), CD79a ((c) original magnification x40), kappa ((d) original magnification x40), and lambda ((e) original magnification x40) and negative for CD20 ((f) original magnification x40).
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Immunohistochemistry (IHC) showed that the neoplastic cells were diffusely positive for CD79a, MUM-1, and CD56 and focally positive for PAX-5 (Figure 2).
Initial CT showing a mass over left frontal and ethmoid sinuses which occupied almost the entire left nasal cavity (a). Repeated CT showing regression of left nasal mass (b).
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fig3
Spontaneous regression of his PBL was further confirmed by a repeat rigid nasal endoscopy, which showed good patency of both nasal cavities, and a repeat CT scan of the paranasal sinuses, which revealed spontaneous regression of his left nasal mass (Figure 3).