Diagnosis, Differential ; Fibrosarcoma ; congenital ; diagnosis ; pathology ; Humans ; Infant ; Male ; Soft Tissue Neoplasms ; congenital ; diagnosis ; pathology

Congenital infantile fibrosarcoma (CIF) is a rare soft-tissue tumor in the pediatric age group and seldom involves the gastrointestinal tract. A 2-day-old boy was transferred to our hospital with a pneumpoperitoneum. After emergency operation, we could find a solid mass wrapping around a sigmoid colon and performed a segmental resection of sigmoid colon including a mass. Histopathologic examination showed an infantile fibrosarcoma origining from the muscular layer of colon. The baby was discharged on the 17th hospital day and followed for 1 yr without recurrence.
Colon, Sigmoid/pathology ; Fibrosarcoma/congenital/*diagnosis/pathology ; Humans ; Infant, Newborn ; Male ; Peritoneum/radiography ; Positron-Emission Tomography and Computed Tomography ; Soft Tissue Neoplasms/congenital/*diagnosis/pathology

Diagnosis, Differential ; Fetus ; Fibroma ; metabolism ; pathology ; Fibrosarcoma ; congenital ; genetics ; metabolism ; secondary ; Hemangiopericytoma ; metabolism ; pathology ; Humans ; Kidney Neoplasms ; pathology ; secondary ; Liver Neoplasms ; pathology ; secondary ; Lung Neoplasms ; pathology ; secondary ; Male ; Nerve Sheath Neoplasms ; metabolism ; pathology ; Rhabdomyosarcoma, Embryonal ; metabolism ; pathology ; Soft Tissue Neoplasms ; congenital ; genetics ; metabolism ; pathology ; Vimentin ; metabolism