A rare intra-abdominal mass in a newborn: gastric teratoma

Gastric teratomas are rare intra-abdominal tumors. They are frequently seen in the neonatal period. A palpable mass is the most common clinical sign. Although radiologic imaging plays a role in diagnosis, in most cases the final diagnosis is made by histopathologic examination. In this report, we present a newborn male patient diagnosed with immature gastric teratoma. A male infant was referred to the clinic due to bloating and a palpable abdominal mass. Ultrasonography revealed a complex solid cystic mass in the abdominal and pelvic region. Magnetic resonance imaging was recommended. MRI revealed a multilocular, multiseptated, complex lesion. Given the radiologic findings, a gastric teratoma was suspected. The patient underwent surgery. On histopathologic examination, an immature grade 3 teratoma was diagnosed. Gastric teratomas are extremely rare tumors and must be considered in the differential diagnosis of abdominal masses during the neonatal and infant period.