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Society for Pediatric Radiology – Poster Archive

Scott Willard

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Showing 4 Abstracts.

We present the case of a 14 year old Asian male with a history of poorly controlled congenital adrenal hyperplasia (CAH) and growing testicular adrenal rest tumors. While on high dose steroid therapy, the lesions decreased in size from 1.1 x 1.0 cm to 0.5 x 0.8 cm. However, they subsequently increased in size, measuring 2 to 3 cm in length when the patient was not compliant with the steroid regimen due to Cushingoid side effects. The masses were bilateral, symmetric, and located at the mediastinum testis, all findings consistent with testicular adrenal rest tumors as opposed to Leydig tumor. With growth, they coalesced to form undulating masses with hyperechoic and hypoechoic layers mimicking the cerebrum, an appearance more typically seen in the adrenal glands at initial diagnosis of CAH. Current practice guidelines in much of the developed world typically result in early diagnosis and advanced therapy, making testicular adrenal rest tumors of this size and appearance unique. Read More

Meeting name: IPR 2016 Conjoint Meeting & Exhibition , 2016

Authors: Willard Scott, Birkemeier Krista

Keywords: congenital adrenal hyperplasia, CAH, testicular adrenal rest tumor, TART

Prenatal screening ultrasound at 18 weeks gestation identified homogeneous enlargement of the distal left leg. There was relative increased blood flow by Doppler, but the bone lengths were symmetric. There were no cysts and no amniotic bands. MRI was performed at 21 weeks gestation for further characterization. MRI demonstrated a lobulated, infiltrative, asymmetric soft tissue signal intensity thickening extending from the knee to the dorsum of the foot. There was no fat content appreciable on T1 or T2 fat saturated images. Given these findings, a vascular soft tissue mass such as kaposiform hemangioendothelioma was the primary differential consideration, with other fibrous tumors considered less likely. Follow up ultrasounds demonstrated commensurate growth of the lesion with the child. At scheduled cesarean delivery, the otherwise healthy female infant had a leg mass that measured 14 cm, extending from the knee to the dorsum of the foot, as seen on prenatal imaging. The skin overlying the lesion was thick and redundant with hypertrichosis. Postnatal MRI was performed on day 2, unexpectedly showing extensive fat signal, along with edema signal and enhancement of the muscle, fat, and thickened skin. There was no abnormal vascularity and no focal mass. There was mild tibial bowing. Incisional biopsy was performed on day 6, with pathologic diagnosis of spindle cell tumor suggestive of fibrous hamartoma of infancy (FHI). This apparent case of FHI is an atypical presentation, with interesting imaging implications. FHI is usually smaller (3-5 cm), more common in males (2.4:1), and only rarely involves the lower extremities distal to the knee (0.5% of cases). Only 23% of FHI are present at birth. To our knowledge, there are no case reports describing the fetal MRI appearance of this entity. Hamartomatous lesions and macrodystrophia lipomatosa had been excluded from the differential diagnosis due to the lack of fat signal intensity on fetal MRI. However, the fetus was imaged in early second trimester and normal subcutaneous fat is usually not visible on MRI until late in the second trimester. This case raises questions regarding the timing of appearance of fat in this lesion. As a result, we recommend that fat containing lesions not be excluded on the basis of absence of fat in early fetal MRI. Repeat MR imaging of musculoskeletal tumors in the third trimester to re-assess content may be useful. Read More

Meeting name: IPR 2016 Conjoint Meeting & Exhibition , 2016

Authors: Willard Scott, Birkemeier Krista

Keywords: FHI, Fibrous hamartoma of infancy, kaposiform hemangioendothelioma, fetal MRI

To describe alternative routes of Nusinersen administration in patients in whom traditional lumbar puncture is limited secondary to spinal hardware and bony fusion. Read More

Meeting name: SPR 2018 Annual Meeting & Postgraduate Course , 2018

Authors: Willard Scott, Kaye Robin, Schaefer Carrie, Aria David

Keywords: Spinraza, Spinal muscular atrophy SMA, nusinersen

Our educational exhibit will be an ultrasound pictorial review of the normal and pathologic conditions of the orbit in children. Read More

Meeting name: SPR 2017 Annual Meeting & Categorical Course , 2017

Authors: Willard Scott, Patel Mittun, Bailey Smita, Miller Jeffrey, Plotnik James, Biyyam Deepa

Keywords: orbit, globe, retina