How many HIFU sessions are needed for fibroids?
HIFU for fibroids is usually performed in a single session lasting from about one to several hours, depending on fibroid size and number. One session does not mean that no procedure will ever be needed later: long-term series report reintervention, by repeat HIFU or another method, in a proportion of patients. That likelihood is closely tied to patient selection and the ablation ratio achieved in the first session.
What does "session" mean?
In HIFU a session is the single treatment block the patient spends on the table. Within it, many sonications (focused shots) are delivered; each inactivates a small volume and the shots are planned side by side to cover the fibroid. So "one session" is not a single burst of energy but a planned sequence.
What sets the number of sessions?
- Fibroid volume: larger volume means more sonications and more time.
- Number of fibroids: with several, priority goes to those causing symptoms; treating all in one session is not always the goal.
- Tissue response: tissue that responds poorly to energy on real-time imaging may change the plan.
- Patient tolerance: pain and positioning tolerance influence whether a session is extended.
Large ultrasound-guided HIFU series planned treatment as a single session and reported a relationship between ablation ratio and clinical outcome.
Studies use different devices and protocols; session lengths vary between centres.
Source: 2020 · Taiwanese Journal of Obstetrics and Gynecolo2022 · International Journal of Hyperthermia
When does a repeat procedure come up?
A second procedure is discussed if the ablation ratio in the first session stayed low, symptoms did not improve enough, or the fibroid regrew on follow-up. That second procedure may be repeat HIFU, myomectomy or embolisation; the choice again follows the fibroid’s condition at that time.
Long-term follow-up reports reintervention rates after HIFU; low ablation ratio, multiple fibroids and younger age are listed among independent risk factors.
Reintervention does not mean the method failed; fibroid disease itself can recur, which also applies after myomectomy.
Source: 2024 · International Journal of Hyperthermia