Dilation

Dilation is the stretching of a narrowed passage with graded instruments to widen it or keep it open. In FTM surgery it means urethral dilation, the first-line treatment for a stricture in the new urethra after urethral lengthening. It does not mean vaginal dilation, which is not part of FTM surgery.

Which dilation do you mean?

Dilation has two senses on trans surgery pages, and only one belongs here. Urethral dilation is a treatment for a stricture, a scar-tissue narrowing of the urethra. Vaginal dilation is the daily routine of keeping a surgically built canal open after vaginoplasty; it turns up in MTF material and in forum threads that mix the two directions. Nothing in FTM surgery needs routine dilation to maintain a result, and after a vaginectomy the canal has been closed, so there is nothing to dilate.

When is urethral dilation used?

Urethral dilation is used when a short, soft stricture forms after urethral lengthening in phalloplasty or metoidioplasty, once a slowing stream has been confirmed by a flow test or a camera. The usual sites are the joins between the new urethra and your original one. Dilation is not preventive: without a stricture there is nothing to stretch.

What does urethral dilation involve?

Urethral dilation involves passing a series of smooth rods or a balloon catheter, each slightly wider than the last, through the narrowed section under numbing gel, usually as an outpatient visit lasting minutes. Some surgeons then teach self-dilation, in other words passing a catheter yourself at home on a schedule that tapers from daily to weekly over a few months, to hold the passage open while the scar softens. It is uncomfortable rather than painful.

How often does dilation work?

Dilation works for a fair share of short strictures and fails for most long or dense ones. Published series on urethral strictures in general put a lasting result from a single dilation at roughly a third to a half of cases, with the rest recurring, often within a year. There is little data specific to a lengthened urethra, and the odds there are unlikely to be better. Self-dilation improves the odds but is maintenance rather than cure, so surgeons treat dilation as a low-cost first attempt, not the fix.

When does surgery replace dilation?

Surgery replaces dilation when a stricture is long, recurs after one or two stretches, or sits next to a fistula, which a tight stricture can open by raising the pressure behind it. The revision opens the narrowed section and widens it, sometimes with a graft such as lining from inside the cheek, and is scheduled once the tissue has settled, typically around six months from the operation that caused it. Dilation or a revision appears in quotes as an extra unless the surgeon includes repairs.

What to ask the surgeon

Ask whether dilation is their first step for a stricture or they go straight to revision, whether they teach self-dilation, what share of dilated strictures came back, and whether dilation and any revision are in the quote.

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