[Differential diagnosis of the interlabial masses in girls under 5-years-old]

The masses that we can be found at interlabial in a girl are a extensive spectrum of heterogenous lesions and often there is a confusion in diagnosis, management and prognosis.

We present 5 cases of interlabial masses, prolapsed urethra, two paraurethral Skene cysts, botryoid sarcoma and fibroepithelial polyp, and its clinical of debut.

A prolapsed urethra is presented in a 4-year-old black girl with vaginal bleeding from edamatous periurethral mass. The paraurethral cyst is a yellowish cystic mass displacing the urethral meatus in two newborn girls. The fibroepithelial polyp is presented in a newborn girl as polipoid and wartlike tumor and not bleeding injury in the introitus. The botryoid sarcoma appears in a 1-year-old girl with ulcerated polypoid mass of 2 cm from vagina. All cases were treated with surgery except the paraurethral cyst that drained spontaneously and the rhabdomyosarcoma was also treated with chemotherapy.

There must be a good clinical examinations about interlabial masses distinguishing genital or urological origin. The surgery is indicated mainly to reject malignancy because the presentation of sarcoma and polyp could be similar. The prognosis of rhabdomyosarcoma vaginal is good with surgery and chemotherapy. The prolapsed urethra is more common in prepubertal black girls and it is important to exclude sexual abuse. The management of paraurethral cyst is controversial but some authors are advised first observation because they may regress.