Given your cardiac status and low ejection fraction, avoiding general anaesthesia is the right decision.
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As for the lesion itself: since there is no obvious ulcer or growth, it could be simple thickening, reflux-related laryngitis, a papilloma, or an infection. But early vocal cord cancer can look exactly like this too, so malignancy cannot be excluded by appearance alone. That is why the biopsy matters — it is the only way to be sure. A stroboscopy and CT/MRI may also be advised beforehand.
Please do not delay. Lesions in this area are highly treatable when caught early.
Discuss these options with your ENT surgeon and cardiologist together.
Health Tips
your lesion is at the anterior commissure, the front-most part of the vocal cords and the hardest area to reach. The awake instruments are small, so the sample may sometimes be inadequate and a repeat biopsy may be needed. If it cannot be done awake, the next option is a very short procedure under light sedation while you breathe on your own — far safer for the heart than full general anaesthesia — planned along with a cardiac anaesthetist