caa a22 4500 605539634 CHVBK 20210128100907.0 cr unu---uuuuu 210128e20150701xx s 000 0 eng 10.1007/s10396-014-0600-6 doi (NATIONALLICENCE)springer-10.1007/s10396-014-0600-6 Ultrasonographic and non-enhanced CT features of acute transient thyroid swelling following fine-needle aspiration biopsy: report of four cases [Elektronische Daten] [Keiko Yamada, Kazuhisa Toda, Aya Ebina, Noriko Motoi, Iwao Sugitani] We report four cases of acute transient thyroid swelling following fine-needle aspiration biopsy, a rare complication of still unknown origin. The ultrasonographic pattern was fairly similar to that in previous reports: swelling of the thyroid with a patchy and heterogeneous appearance and diffusely scattered hypoechoic "cracks” that showed no blood flow signals with color Doppler ultrasound. There were also some features that differed from those in previous reports. Though thyroid swelling is typically diffuse and bilateral, it was unilateral or asymmetrical in some of our cases. While thyroid swelling is said to resolve spontaneously within 1-20h, abnormal ultrasonographic findings persisted for more than 48h in one case. Unlike previous reports, we have experienced cases with ultrasonographic findings of concomitant minor subcapsular hematomas. In one case, CT demonstrated not only thyroid swelling but also abnormal attenuation in perithyroid tissue extending to the retro-hypopharyngeal space and to the paraesophageal mediastinum. Although vasodilatation and diffuse vascular leakage are speculated to be the underlying mechanisms, our ultrasonograms at the time of the complication failed to demonstrate enlarged intrathyroidal vessels or hypervascularity with color Doppler ultrasound. More awareness and a description of the cases may help to clarify the pathogenesis of this self-limited complication. The Japan Society of Ultrasonics in Medicine, 2014 Acute transient thyroid swelling nationallicence Fine-needle aspiration cytology nationallicence Thyroid nodule nationallicence Ultrasound nationallicence CT nationallicence Yamada Keiko Department of Ultrasound, Cancer Institute Hospital, 3-8-31 Ariake, 135-8550, Koto-Ku, Tokyo, Japan aut Toda Kazuhisa Department of Head and Neck Surgery, Cancer Institute Hospital, 3-8-31 Ariake, 135-8550, Koto-Ku, Tokyo, Japan aut Ebina Aya Department of Head and Neck Surgery, Cancer Institute Hospital, 3-8-31 Ariake, 135-8550, Koto-Ku, Tokyo, Japan aut Motoi Noriko Department of Pathology, Japanese Foundation for Cancer Research, 3-8-31 Ariake, 135-8550, Koto-Ku, Tokyo, Japan aut Sugitani Iwao Department of Endocrine Surgery, Nippon Medical School, 1-1-5 Sendagi, 113-8603, Bunkyo-Ku, Tokyo, Japan aut Journal of Medical Ultrasonics Springer Japan 42/3(2015-07-01), 417-425 1346-4523 42:3<417 2015 42 10396 https://doi.org/10.1007/s10396-014-0600-6 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10396-014-0600-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Yamada Keiko Department of Ultrasound, Cancer Institute Hospital, 3-8-31 Ariake, 135-8550, Koto-Ku, Tokyo, Japan aut NATIONALLICENCE 700 1- Toda Kazuhisa Department of Head and Neck Surgery, Cancer Institute Hospital, 3-8-31 Ariake, 135-8550, Koto-Ku, Tokyo, Japan aut NATIONALLICENCE 700 1- Ebina Aya Department of Head and Neck Surgery, Cancer Institute Hospital, 3-8-31 Ariake, 135-8550, Koto-Ku, Tokyo, Japan aut NATIONALLICENCE 700 1- Motoi Noriko Department of Pathology, Japanese Foundation for Cancer Research, 3-8-31 Ariake, 135-8550, Koto-Ku, Tokyo, Japan aut NATIONALLICENCE 700 1- Sugitani Iwao Department of Endocrine Surgery, Nippon Medical School, 1-1-5 Sendagi, 113-8603, Bunkyo-Ku, Tokyo, Japan aut NATIONALLICENCE 773 0- Journal of Medical Ultrasonics Springer Japan 42/3(2015-07-01), 417-425 1346-4523 42:3<417 2015 42 10396