Clinical presentation included a palpable abdominal mass in 5 patients, abdominal pain in 7 cases,diarrhea in 1 patient, nausea and abdominal distention in 2 cases.9 patients were asymptomatic.

• 首诊临床表现为腹部肿物5例、腹痛7例、腹泻1例、恶心腹胀2例等，9例无任何临床症状。