Malignant Peripheral Nerve Sheath Tumour Manifested as a Perineal Mass: A Case Study and Review Of the Literature. J. Anal. Oncol. [Internet]. 2025 Oct. 27 [cited 2026 Jul. 12];14:69-74. Available from: https://mail.neoplasiaresearch.com/index.php/jao/article/view/893