Age / Sex : 60 / F

Chief complaint : Right thumb mass with rupture


What is your diagnosis?

Two weeks later, you can see the final diagonosis with a brief discussion of this case (Please submit only one answer)

Courtesy : 이승은 (Seungeun Lee), 서울성모병원 (Seoul St. Mary’s Hospital)

Malignant melanoma

Discussion

Findings
1. Intermediate/high signal intensity on T1-weighted images (due to paramagnetic effect of melanin) and mixed signal intensity containing high and low signal on T2-weighted images
2. Predominantly located at skin layer (arising from other sites much more infrequently)

References
1. Masaya Kawaguchi et al., MR imaging findings for differentiating cutaneous malignant melanoma from squamous cell carcinoma, European Journal of Radiology, 2020;132:109212
2. Patnana M. et al., Multimethod imaging, staging, and spectrum of manifestations of metastatic melanoma. Clin. Radiol. 2011; 66: 224-236