Table 1. A literature review was conducted on case reports documenting the coexistence of BD and MCC from January 2015 to April 2024.

Reference	year	Age/Sex	Site	Metastases	Diagnosis	Primary site
Chen X et al. [3]	2024	51/M	Right waist	No	MCC/BD	Epidermis
		87/F	Right mandible	No	MCC/BD	Epidermis
Jeha GM et al. [4]	2024	83/M	Neck	Yes	MCC/SCC in situ	Subcutis
Swain et al. [5]	2022	32/F	Right dorsum of the hand	Yes	MCC/BD	Epidermis
Kiyohara T et al. [6]	2019	65/M	Left leg	Yes	MCC/BD	Dermis to the subcutis
Yang A et al. [7]	2019	71/M	Right cheek	unreported	MCC/SCC in situ	Epidermis
Casari A et al. [8]	2018	85/F	Left cheek	unreported	MCC/BD	Epidermis
Czapiewski P et al. [9]	2016	76/F	cheek	Yes	MCC/SCC in situ	No described
		77/M	capillitium	No	MCC/BD	No described
Miraflor AP et al. [10]	2016	71/M	Left zygoma	No	MCC/BD	Epidermis
McGowan et al. [11]	2016	73/F	Right mandible	No	MCC/SCC in situ	Epidermis
Chou et al. [12]	2016	77/F	Right breast	Yes	MCC/BD	Epidermis
Tono et al. [13]	2015	71/M	back	unreported	MCC/BD	No described
Schick et al. [14]	2015	93/F	Left mandible	No	MCC/SCC in situ	Dermis