Not a medical person, and I'm not sure that there might not be other éperons than this tracheal one, in the case your text is addressing one in some other part of the lungs.

carène ou éperon trachéal
Cet article est extrait de l'ouvrage « Larousse Médical ».
Zone anatomique correspondant à la division de la trachée en ses deux bronches principales (ou souches), destinées à la ventilation des poumons droit et gauche. (P.N.A. carena tracheæ.)
https://www.larousse.fr/encyclopedie/medical/carène/11791

The carina of trachea (also: "tracheal carina"[1]) is a ridge[1] of cartilage[2] at the base of the trachea separating the openings of the left and right main bronchi.[1][2]
https://en.wikipedia.org/wiki/Carina_of_trachea

carène de la trachée l.f.
carina tracheae (TA)
carina of trachea
crête médiane antéro-postérieure qui sépare, au niveau de la bifurcation trachéale, les orifices supérieurs des bronches souches droite et gauche.
Cet éperon est le plus souvent supporté par une charpente cartilagineuse dépendant du dernier anneau trachéal ou de l’un des premiers anneaux de l’une ou l’autre des bronches souches. Il est parfois constitué uniquement par les parties molles de la trachée.
Syn. anc. éperon trachéal
https://www.academie-medecine.fr/le-dictionnaire/index.php?q...

Selon mon dictionnaire médical Masson, on cite carène comme synonyme d'éperon, qui est en anglais carina (carinae). Il s'agit d'une crête séparant au niveau de la bifurcation trachéale les orifices des bronches souches.

In my experience as a professional anatomist, the term carina is usually applied only to the area under the bifurcation of the trachea into the two main bronchi. see
https://www.imaios.com/en/e-anatomy/anatomical-structure/car...

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Note added at 2 hrs (2024-02-27 10:51:34 GMT)
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though there is sometimes reference to a secondary carina.

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Note added at 2 hrs (2024-02-27 10:56:59 GMT)
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In this case a) épérons is plural b) the operation clearly takes place within the lung wheren the mass is located.

There is a technique, known as bronchial spur biopsy -https://onlinelibrary.wiley.com/doi/full/10.1111/bjh.15966
Bronchial spur biopsy was performed in 17 patients, and each revealed a diffuse mucosal infiltration by small B-lymphocytes,

Finally, although our study is limited in that it is retrospective and because of the small sample size, it nevertheless has identified three key diagnostic elements of SBi: bronchial symptoms in the absence of infection, endobronchial nodules revealed in a lung scan, and positive bronchial spur biopsy.


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also here
alhttps://www.sciencedirect.com/topics/immunology-and-microbio...
It may be placed slightly toward the posterior or the anterior. It is bordered by the lobar spur, which is large, at a 90 degree angle by the fusion of the outer wall of the bronchus intermedius and the inner side of the upper lobe bronchus.

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Note added at 2 hrs (2024-02-27 11:05:06 GMT)
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Spurs appear at the subdivision of bronchi and are visible on imaging
https://www.researchgate.net/figure/Bronchoscopy-shows-an-ob...


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Note added at 2 hrs (2024-02-27 11:13:12 GMT)
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The carina separating the main bronchi and the spur between the middle and basal lobe within the lung are shown here -
https://www.researchgate.net/figure/Bronchoscopic-findings-o...

Spur is a tool used some irregularities shown in the different crazy imagery of bones