PMC6599057_01
(A, B) CT showing an intratracheal tumor; (C) bronchoscopy showing a tumor on the posterior wall of the trachea and a fissure-like stenosis between the tumor and tracheal wall. CT, computed tomography.
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The corresponding tracheal cavity became narrow, and the pathological change in the surrounding tissue outside the trachea and within its boundaries was clear, without other abnormal findings; therefore, a tracheal tumor was considered ( Fig. 1A , B ). The bronchoscopy showed that there was a tumor (~1.5 cm below the glottis) on the posterior wall of the trachea, which demonstrated an ~2.3 x 2.3 cm hemispherical bulge with smooth and soft surfaces; moreover, most of the tracheal cavity was occupied, and a fissure-like stenosis was formed ( Fig. 1C ).
(A) Bronchoscopy showing a tracheal stent placed inside the tracheal cavity. (B) Bronchoscopy showing an extratracheal tumor swelling into the trachea. (C) CT showing a tracheal stent placed again and complete patency of the stent. CT, computed tomography.
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The upper edge of the stent was located ~1.5 cm below the glottis, and the lower edge was 7 cm away from the carina of the trachea ( Fig. 2A ). A 2.0 x 2.3 cm tumor (~1.5 cm below the glottis) was found on the posterior wall of the trachea, whose surface was rough ( Fig. 2B ). AS-1 snare, and the tracheal stent was placed again to improve the patient's ventilation. After 4 days, chest CT showed complete patency of the stent ( Fig. 2C ). 
(A) Macrography showing a resected tracheal tumor and rings. (B) Pathological examination confirming a tracheal lipoma. (C) Postoperative CT showing tracheal patency and no tumor. CT, computed tomography.
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The length of the resected trachea was 4.9 cm, including seven tracheal rings ( Fig. 3A ). Tracheal lipoma was diagnosed according to the postoperative pathological examination ( Fig. 3B ). The mandibular and anterior chest threads were removed 3 weeks after the surgery; tracheal patency was confirmed by CT 3 months postoperatively, and no tumor was found ( Fig. 3C ).