第19巻 2023年8月　第3号

■症例報告

PETパラメトリックイメージングが診断の一助となった副腎のchronic expanding hematomaの1例
林　暢彦¹, 桐山　智成¹, 小林　理佳¹, 中込　哲平¹, 楊　菜洋¹, 汲田　伸一郎¹, 木村　剛², 近藤　幸尋^2
1日本医科大学付属病院放射線科
²日本医科大学付属病院泌尿器科

A Case of Chronic Expanding Hematoma of the Adrenal Gland with Positron Emission Tomography Parametric Imaging
Nobuhiko Hayashi¹, Tomonari Kiriyama¹, Rika Kobayashi¹, Teppei Nakagomi¹, Nahiro Yan¹, Shin-ichiro Kumita¹, Go Kimura² and Yukihiro Kondo^2
1)Department of Radiology, Nippon Medical School Hospital
²⁾Department of Urology, Nippon Medical School Hospital

Chronic expanding hematomas (CEH) are hematomas that continue to expand at least one month after onset. CEH often occur in the thoracic cavity or in the extremities secondary to trauma, surgery, anticoagulation therapy, or bleeding disorders. Few studies have reported CEH in retroperitoneal organs such as the adrenal glands and lesions without an apparent etiology. An 80-year-old woman was referred to our hospital for evaluation of a retroperitoneal tumor that was incidentally detected on ultrasonography. Computed tomography and magnetic resonance imaging showed a large left retroperitoneal mass (14 cm in diameter) with gradual peripheral enhancement and a suspected hemorrhagic component within the lesion. Parametric imaging using positron emission tomography (PET) showed mild accumulation of the tracer at the margins of the mass on the conventional standard uptake value images, relatively low accumulation on the slope images, and slightly higher accumulation on intercept images. Postoperative histopathological examination of the resected specimen revealed a mass that was encapsulated with fibrous tissue and primarily consisted of organized clots without evidence of tumor cells; the mass was diagnosed as an idiopathic CEH of the adrenal glands. The margins of the mass showed few inflammatory cell infiltrates consistent with the findings of parametric imaging, which appeared to accurately reflect the dynamics of fluorodeoxyglucose (FDG) in the body. PET parametric imaging can separately assess the metabolism and distribution of FDG in vivo and may be useful to determine the etiology and diagnosis of CEH.

日医大医会誌 2023; 19(3), 263-268

Key words
chronic expanding hematoma, parametric imaging, adrenal hemorrhage, adrenal tumor, positron emission tomography

Correspondence to
Teppei Nakagomi, Department of Radiology, Nippon Medical School Hospital, 1-1-5 Sendagi, Bunkyo-ku, Tokyo 113-8603, Japan
E-mail：n-teppei@nms.ac.jp

受付：2023年3月17日　受理：2023年5月19日