Pictures would certainly be helpful in this case.  However, I can offer a
bit of information in their temporary absence.
 
If the mass is truly in the vagina, then the likelihood is that it is
benign - most smooth masses in the reproductive tract are of smooth
muscle origin, and usually benign.  They may be difficult to remove, but
once removed completely, do not recur.
 
However, if the tumor is not within the vaginal tract, but outside of it,
then the chance of malignancy is significantly higher.  In this area,
squamous cell carcinoma or a malignancy of the apocrine sweat glands in
the perivulvar area are the most common neoplasms, and are usually quite
invasive.  Removal of a tumor that extends deeply would be problematic at
best, and there is a strong likelihood that internal metastasis has already
occurred.
 
Any images of this tumor would be helpful.
 
With kindest regards,
Bruce H. Williams, DVM, DACVP
 
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[Posted in FML issue 3430]