Vaginal Malignant Melanoma: Case Report and Review of the Literature

Primary vaginal malignant melanomas are rare tumours with a limited number of cases published in the literature. They primarily affect post-menopausal women with a median age of 57-68 years and have a dismal prognosis. The 5-year survival rate, regardless of treatment, is approximately 5-25%.

We present the case of an 87-year-old female who presented with haematuria and urinary incontinence. She was diagnosed with AJCC stage IIIC vaginal melanoma. Considering her age and the extent of malignancy, surgery was not a viable option and immunotherapy with nivolumab and ipilimumab was initiated as treatment.

The diagnosis of vaginal melanomas includes pathological analysis and immunohistochemistry (IHC) of the mass, imaging to determine extent, and genetic testing. Surgery is the preferred treatment in suitable cases. For metastatic or unresectable cases, immunotherapy or targeted therapy is the preferred first-line treatment. Due to the lack of an adequate number of cases to conduct randomized clinical trials, prognostic factors and treatment protocols for vaginal melanomas are not clearly defined. At present, the management of these tumours is largely based on retrospective studies and anecdotal evidence accompanied by significant knowledge gaps. Our case will be a valuable addition to the existing literature on vaginal melanomas that are managed non-surgically.

Vaginal melanomas are extremely rare entities that require early diagnosis to ensure the best prognosis.Providers need to stress the importance of elderly gynaecological examination so crucial diagnoses are not missed.Further research is necessary to develop the most effective treatment plan for vaginal melanomas.