case_images: PMC6334347_01
case_images: Computed tomography (CT) scan showing a mass causing an opacification of the right nasal cavity, ethmoid and maxillary sinuses.
case_images: CRIPA2019-8201674.001.jpg
case_images: PMC6334347_01_CRIPA2019-8201674.001.jpg
case_images: fig1
case_images: On radiological evaluation, CT scan revealed an opacification of the right nasal cavity, maxillary, ethmoidal, sphenoid, and frontal sinuses with bone remodeling of the septum to the left side (Figure 1).
case_images: Microscopic analysis showing sheets of small round blue cells.
case_images: CRIPA2019-8201674.002.jpg
case_images: PMC6334347_01_CRIPA2019-8201674.002.jpg
case_images: fig2
case_images: Histopathological analysis showed a small blue cell tumor (Figure 2).
case_images: Immunohistochemistry of tumour sample showing CD99 positivity.
case_images: CRIPA2019-8201674.003.jpg
case_images: PMC6334347_01_CRIPA2019-8201674.003.jpg
case_images: fig3
case_images: Immunohistochemistry showed the neoplastic cells are positive for CD99 marker (Figure 3).