Table 1.

Patient demographics and clinical features.

Case number	Gender	Age	Clinical symptom	Ultrasound manifestations	Primary site	Metastasis	Treatment	Follow-up	Recurrence	Survival
1	Male	4y3m	Liver contusion 6 months ago	A low echo mass of about 9.1 * 7.5 * 5.3 cm was detected in the lower right abdomen, with an irregular shape; there were a nodular echo inside and more abundant blood flow signal	Ascending colon wall	No	Surgical resection	3 months	No	Yes
2	Female	3y10m	Abdominal pain for 2 days	A hypoechoic mass of about 8.5 * 6.2 * 5.7 cm was probed in the lower right abdomen, with an irregular shape; there were nodular and hemp-like echoes and more abundant blood flow signal	Colonic serosa	No	Surgical resection plus chemotherapy	3 years	No	Yes
3	Male	14y8m	Frequent micturition, the urgency of urination, and the dysuria for half a month	A hypoechoic mass of about 6.3 * 5.4 * 5.0 cm was detected in the upper anterior bladder, with an irregular shape; there were nodular and hemp-like echoes and more abundant blood flow signal	Posterior wall of the bladder	Pathology: malignant	Surgical resection and chemotherapy	3 years	No	Yes
4	Male	14y9m	After eating, wheezing sensation accompanied by vomiting for more than 1 year, which was aggravated for 3 months	During chemotherapy, a low echo mass of about 2.7 * 2.2 * 2.1 cm was seen in the upper left of the bladder; the shape was irregular, the echo was not uniform, and there were nodular and hemp-like echoes inside and more abundant blood flow signal	Gastric-momentum	Pelvic cavity	A gastric, omental mass was found by gastroscope, CT, and small intestine water imaging (MRI), followed by surgical resection and chemotherapy; during the chemotherapy, a mass in the pelvic cavity was detected by ultrasound; then surgical resection and chemotherapy were performed	3 years	No	Yes
5	Female	4y4m	Abdominal mass with intussusception	A mass of 4.3 * 3.2 * 2.7 cm was found after right mid-abdominal exploration; the transverse section was concentric circle and the longitudinal section was pseudonephrogram; no bowel movements were seen (the above was an intussusception image); a low echo envelope of 3.6 * 3.3 * 3.2 cm can be detected in the inner side (upper right abdomen) with an irregular shape; the boundary was still clear, the internal echo was still uniform, and rich blood flow signal can be detected in the low echo envelope	Ascending colonic mucosa	No	Surgical resection	6 months	No	Yes
6	Male	15y	Metastatic right lower abdominal pain for 3 days	A low echo mass of about 7.3 * 3.9 * 6.4 cm was detected in the lower right abdomen, with an irregular shape; the boundary was unclear; the internal echo was uneven; the calcified plaque with a diameter of 1.0 cm can be seen inside; the echo of the surrounding omentum was enhanced; and the the rich blood flow signal was explored	Right lower quadrant	No	Biopsy and automatic discharge after anti-inflammatory treatment, without resection	Lost
7	Male	4y8m	Intermittent abdominal pain for 1 week	A low echo mass of about 6.4 * 6.3 * 5.6 cm was observed in the right middle lower abdomen, with an irregular shape; the boundary was unclear; the internal echo was uneven; the echo of the surrounding omentum was enhanced; and the rich blood flow signal was explored	Colonic serosa	No	Surgical resection	8 months	No	Yes