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Society for Pediatric Radiology – Poster Archive

Marie-helene Gagnon

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Showing 2 Abstracts.

A 16 year old previously healthymale patient who initially presented with daily recurrent fevers and chills lasting 5-10 minutes. His parents brought him to a tertiary care hospital after developing vomiting and weight loss in the setting of progressively worsening fevers. Initial work up was remarkable for elevated CRP and a negative infectious workup. An MR enterography ordered to evaluate for a cause of weight loss demonstrated incidental lung base lesions. Follow up CTA revealed a lesion within the right ventricle and multiple lung nodules, concerning for endocarditis and septic emboli. He underwent two surgical resections over two months for the ventricular mass. Pathology revealed findings consistent with necrotizing endocarditis. During his hospital course, he was found to have a left cephalic venous thrombosis and was placed on Xarelto, later developing a right subclavian vein thrombus while on anticoagulation. He was readmitted 1 month later after presenting for right chest and right upper quadrant pain. Initial chest X-ray revealed right lower lobe mass and follow up CTA revealed two large right pulmonary artery pseudo-aneurysms. He underwent cardiac catheterization for pre-operative coiling of the pseudo-aneurysms and subsequent right lower lobectomy. Pathology revealed necrotizing arteritis and pulmonary artery pseudo-aneurysms. Based on clinical presentation and further work up, he was diagnosed with Hughes Stovin Syndrome and started on Cytoxan and Apixaban. While not yet considered in remission, his symptoms have improved since initiating treatment. Hughes Stovin Syndrome (HSS) is a rare disorder characterized by thrombophlebitis as well as multiple pulmonary and/or bronchial aneurysms. There is a male predilection, usually presenting between 12-48 years. There have been less than 40 cases published in the English literature. HSS is thought to be a variant of Bechet’s but does not present with oral or genital ulcers. The lack oral and genital ulcers in this patient excluded a diagnosis of Bechet’s. The underlying cause of HSS is unclear but is believed to be due to angiodysplasia or infection. Since there is no formally described diagnostic criteria, the clinical presentation of thrombophlebitis with pulmonary artery aneurysms characterize the disease. We present this case to illustrate the clinical presentation of a rare and possibly under recognized syndrome. Read More

Meeting name: SPR 2022 Annual Meeting & Postgraduate Course , 2022

Authors: Gagnon Marie-helene, Richer Edward, Alazraki Adina

Keywords: Vasculitis, Aneurysm, Thrombophlebitis

Germ cell tumors of childhood are most often gonadal in origin. Extragonadal germ cell tumors are located characteristically in the midline arising intracranially, in the mediastinum, pelvis or retroperitoneum. These tumors are generally easily diagnosed due to typical sites of origin and characteristic imaging findings. However, germ cell tumors can be associated with unusual clinical syndromes or imaging features that can perplex the clinician/radiologist. We will review and illustrate atypical imaging/clinical manifestations and complications of germ cell tumors in childhood, based on our experience at two large children’s hospitals. These atypical findings include: Atypical metastatic disease: a) Burned out tumor – Testicular primary not typically evident with viable metastatic disease in retroperitoneal lymph nodes distant viscera, b) Growing teratoma syndrome (increasing size of tumor/pseudoprogression despite appropriate therapy), c) gliomatosis peritonei (maturation into glial tissue during therapy with pseudoprogression on FDG-PET), d) ossified pulmonary metastasis mimicking granulomas Antibody mediated paraneoplastic syndromes: a) anti–N-methyl-D-aspartate (NMDA)– receptor antibody–mediated encephalitis associated with ovarian teratomas, b) anti-Ma2 antibody-mediated encephalitis associated with testicular germ cell tumors Endocrine manifestations: a) Precocious puberty/gynecomastia due to hormonal (hCG) production, b) hyperthyroidism (TSH stimulation and struma ovarii) Local complications: a) ovarian torsion (common), b) ruptured teratoma or dermoid cyst (uncommon) Unusual primary tumors: a) Multifocal primary (e.g. pineal and suprasellar germinoma), b) Currarino triad, c) fetus-in-fetu, d) malignant transformation Read More

Meeting name: SPR 2022 Annual Meeting & Postgraduate Course , 2022

Authors: Gagnon Marie-helene, Parikh Ashish, Taylor Susan, Derenoncourt Paul-robert, Ponisio Maria, Khanna Geetika

Keywords: growing teratoma, gliomatosis peritonei, NMDA encephalitis