1. A Rare Presentation of Melanoma as a Retroperitoneal Mass Seen on FDG PET
   Yutang Yao et al, 2020, Clinical Nuclear Medicine CrossRef
2. Primary Retroperitoneal Melanoma Presented in a Rare Extracutaneous Site for Malignant Melanoma
   Mohamed Alsharedi et al, 2016, Rare Tumors CrossRef
3. Primary Retroperitoneal Malignant Melanoma with Involvement of Iliac Artery and Vein
   Aislyn Oulee et al, 2021, Case Reports in Medicine CrossRef
4. Ileus secondary to a retroperitoneal malignant melanoma
   Chin-Fan Chen et al, 2013, Biomarkers and Genomic Medicine CrossRef