Symptom
Hourglass deformity
Hourglass deformity is a narrowed band or indentation along the shaft during erection.
It can be more functionally important than a simple curve, because the narrowed area may create weakness or instability where the erection is supposed to be strongest.
Why narrowing matters
It reflects uneven expansion
A narrowed band usually means plaque is restricting expansion at one point along the shaft, while the surrounding tissue continues to expand normally.
A modest curve with narrowing can be worse than a larger curve without it
Function depends on whether the erection holds together. A clean curve can still be functional; a waist-shaped one often is not.
Stability is the main concern, not appearance
The right question is whether the erection feels solid through the act, not whether it looks unusual at rest.
Narrowing can overlap with hinge effect or buckling
Where the shaft narrows is often where it gives way. The two findings travel together more often than not.
Describe shape, narrowing, and stability together
A clinician learns more from your description of how the erection behaves under load than from a still photograph of how it looks at rest.
Seek evaluation if narrowing is affecting confidence, penetration, or erection stability.
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