Melanoma metastases in the abdomen and pelvis: Frequency and patterns of spread

Table 5 Overall frequency of atypical metastases and rate of atypical metastases based on primary location

Primary site	Cases with atypical metastases n (% of cases with metastases)	Cases with only atypical mets
		n	% of cases of that primary	% of cases of that primary with metastases	% of cases with only atypical metastases
Head/neck	14/24 (58.3)	4	4.5%	16.7%	19.0%
Back	20/40 (50)	5	4.4%	12.5%	23.8%
Lower extremity	15/54 (27.8)	6	5.8%	11.1%	28.6%
Anterior chest wall	5/12 (41.7)	2	6.1%	16.7%	9.5%
Ocular	5/20 (25)	0	0%	0%	0%
Upper extremity	4/8 (50)	1	3.4%	12.5%	4.8%
Pelvis	2/5 (40)	1	6.7%	20%	4.8%
Anorectal	1/3 (33.3)	0	0%	0%	0%
Sinonasal	1/3 (33.3)	0	0%	0%	0%
Anterior abdominal wall	0/1 (0)	0	0%	0%	0%
Labia/vagina	0/1 (0)	0	0%	0%	0%
Oral mucosa	0/0 (0)	0	0%	0%	0%
Enteric	0/0 (0)	0	0%	0%	0%
Unknown	4/10 (40)	2	13.3%	20%	0%