Teratomas are the most frequent germ cell tumors. According to their histology, they can be divided into mature and immature, the latter with aggressive and a higher rate of recurrence. They can be located along the entire midline, with the gonadal location being the most frequent. In extragonadal the most frequent is at the sacrococcygeal, mediastinal, cervicofacial, and retroperitoneal levels. Retroperitoneal teratomas account for 3-4% of all germ cell tumors and are preferentially located in the pararenal area. Less frequent are pericardial teratomas, the vast majority being of the mature type. These require urgent resection, which is mainly determined by possible complications such as pericardial effusion and cardiac tamponade. Results: Case 1, a 14-month-old female patient, healthy, under study for gastroesophageal reflux with US finding of a right adrenal mass, with suspicion of neuroblastomas. MRI showed a right adrenal solid mass, hyperintense in T1 and T2 sequences, with a signal drop in low suppression sequences, compatible with a teratoma that was resected without incident. Case 2, a 6-year-old male patient with a retroperitoneal mass detected as a finding in an abdominal ultrasound, it was separated and heterogeneous to US, with suspicion of a low-flow vascular malformation of the lymphoid type. MRI showed a metacystic lesion, with a single vascular pedicle, some loculi with thickened walls and areas of polypoid appearance inside, hypertrophic polypoid areas in its interior, hyperintense in T1 and hypointense in T2 suggestive of hematic/proteinaceous content. Case 3, female patient with a thoracic mass associated with pericardial effusion on prenatal US. A fetal MRI confirmed a lesion with a cystic appearance, with an area compatible with fat highly suggestive of a pericardial teratoma associated with effusion. In all cases, the excisional biopsy of the lesions was compatible with mature teratomas. Conclusions: Most teratomas are of gonadal location. The extragonadal, as in our cases, are less frequent and tend to be benign in behavior. Careful analysis of the images, especially the presence of fat associated with cystic and variable solid content, may suggest the nature of these lesions. Regardless of their appearance and location, the management of all teratomas is surgical resection. Read More

Meeting name: SPR 2024 Annual Meeting & Postgraduate Course , 2024

Authors: Esparza Olave Paulina, Ziehe Luis, Garcia Bruce Cristian, De Barbieri Florencia

Keywords: retroperitoneal tumor, pericardic tumor

Soft tissue tumours are uncommon in newborns and is a group of heterogenous group of anomalies, including benign vascular tumours, like hemangiomas with excellent prognosis or myofibroma that can regress spontaneously, intermedium lesions like tufted angioma and other far less common tumors, like fibrosarcoma and kaposiform hemangioendothelioma, with higher grades of malignancy and variable prognosis. Imaging evaluation is mostly performed with US and MRI. Other technics, like radiography or computed tomography have a limited role in the diagnosis. The purpose of this exhibit is to show and discuss clinical and imaging findings in different soft tissue tumors that may present in the newborn period. Hemangiomas are by far the most common soft tissue tumours founded at this age, with characteristic clinical presentation and evolution and most of them do not need any imaging studies. The other tumors may have characteristic imaging findings that can lead to the correct diagnosis. However, management and diagnosis are often challenging and biopsy or even excision may be required for a definitive diagnosis. This exhibit will show examples of infantile hemangioma, kaposiform hemangioendothelioma, congenital fibrosarcoma, tufted angioma, myofibroma. Pediatric radiologists should be familiar with the imaging findings in soft tissue masses in the neonatal period, and thus facilitate an early diagnosis, prevent unnecessary studies, and assess potential complications. Read More

Meeting name: SPR 2024 Annual Meeting & Postgraduate Course , 2024

Authors: Ziehe Luis, Garcia Bruce Cristian, Esparza Olave Paulina, Cossio María, De Barbieri Florencia

Keywords: kaposiform hemangioendothelioma, congenital fibrosarcoma, myofibroma

Skin lesions are not infrequent in children. There is a wide spectrum of lesions and color Doppler High- resolution Ultrasonography plays an important role in the diagnosis. The purpose of this exhibit is to show some skin lesions that can be seen less commonly in this age group, emphasizing the sonographic appearance and clinical and pathological correlation Read More

Meeting name: SPR 2024 Annual Meeting & Postgraduate Course , 2024

Authors: Garcia Bruce Cristian, Ziehe Luis, Cossio María, Esparza Olave Paulina, Schulze Clara, De Barbieri Florencia

Keywords: dermathology