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

Table 3 Rate of metastases by primary location and common location of metastases by location of primary tumor

Location of primary tumor	Cases with metastases		Most common sites of metastatic disease
	n	%
Lower extremity	54/103	52.4%	Pelvic lymph node 53.7%	Liver 29.6%	Retroperitoneal lymph node 20%
Back	40/114	35.1%	Liver 45%	Adrenal 25%	Spleen 22.5%
Head/neck	24/88	27.3%	Liver 62.5%
Ocular	20/72	27.8%	Liver 70%	Abdominal lymph node 15%
Anterior chest wall	12/33	36.4%	Liver 41.7%	Adrenal 16.7%	Pelvic lymph node 16.7%
Upper extremity	8/29	27.6%	1	1	1
Pelvis	5/15	33.3%	1	1	1
Anorectal	3/13	23.1%	1	1	1
Sinonasal	3/10	30%	1	1	1
Anterior abdominal wall	1/8	12.5%	1	1	1
Labia/vagina	1/4	25%	1	1	1
Oral mucosa	0/3	0%	1	1	1
Enteric	0/1	0%	1	1	1
Unknown	10/15	66.7%	1	1	1

¹Distribution of metastases not detailed due to low number of primary tumors at these locations which would be expected to substantially skew the data.