PMC5779751_01
CT revealing a mass occupying almost the entire trachea space. CT = computed tomography.
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F1
CT revealed a well-defined nodular mass in the posterior wall of trachea causing obstruction, without signs of invasion of the tracheal walls (Fig. 1).
(A) Bronchoscopy shows an obstructive and fleshy tracheal mass markedly narrow the lumen. (B) Bronchoscopy shows that the tumor was excised almost completely.
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F2
Flexible bronchoscopic examination was done, which evidenced a mass arising from posterior wall of trachea 7 cm below glottis occluding approximately 90% of the lumen (Fig. 2A). Surgical treatment was arranged and the tumor was excised almost completely by bronchoscopic electrocautery snare combined with CO2 cryotherapy (Fig. 2B).
Photomicrograph of surgical specimen. Diffuse infiltrate of neoplastic monoclonal well-differentiated plasma cells is present. (H and E,   200).
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F3
The histopathological study identified a diffuse infiltrate of neoplastic monoclonal well differentiated plasma cells (Fig. 3).
Neoplastic cells showed diffuse membrane positivity for CD138 at immunohistochemical staining. (IHC, x200).
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F4
The immunohistochemical profile demonstrated plasma cells express CD138, a marker characteristically positive for plasma cells (Fig. 4).