Gastroduodenal ulceration after selective internal radiation therapy of liver tumor

Image-guided interstitial brachytherapy is used for the treatment of primary and secondary liver tumors. Millions of non-biodegradable yttrium-90 (⁹⁰Y)-imprinted microspheres with a diameter of 29 – 35 μm are selectively infused by a catheter into the branch of the hepatic artery supplying the tumor. Thereby, a radiation dose of 30 – 60 Gy can be applied to the tumor tissue. ⁹⁰Y is a beta-emitter with an average tissue penetration depth of approximately 2.5 mm and a physical half-life of 2.67 days (64.2 hours) [1] [2]. Gastroduodenal ulceration occurs in less than 5 % after selective internal radiation therapy (SIRT) [2] [3] [4].

We present a case of radiation-induced gastric ulceration after SIRT for the treatment of hepatic metastases from breast cancer in a 54-year-old female patient ([Fig. 1]). At 2 months after SIRT, the patient presented with epigastric pain and was diagnosed as having anemia. Upper gastrointestinal endoscopy revealed a single, flat ulcer in the gastric antrum ([Fig. 2]) and histological examination of two forceps biopsy specimens demonstrated chemical-reactive inflammation and ulceration without Helicobacter infection. Proton pump inhibitor (PPI) was prescribed as an oral medication.

Fig. 1 Angiographic view in a 54-year-old female patient with hepatic metastases from breast cancer showing the hepatic arteries with aberrant branches of the left (white arrow) and right hepatic (black arrow) arteries extending to the stomach and not suitable for coiling. The injection site was distal to the aberrant branches to prevent reflux.

Fig. 2 Endoscopic image of the antral ulceration and severe mucosal inflammation in the lesser curve of the stomach 2 months after selective internal radiation therapy (SIRT).

A repeat endoscopy after 2 months revealed the ulceration was unchanged ([Fig. 3]). Upper endoscopic ultrasound showed the antral ulcer, but no tumor of the stomach ([Fig. 4]). At the same time, nearly 4 months after SIRT, 16 forceps biopsy samples were taken and histological examination revealed microspheres in the gastric tissue, with inflammation and ulceration ([Fig. 5]). Retrospectively, the ulcer was caused by reflux of ⁹⁰Y-micropheres into aberrant branches of the left and right hepatic arteries extending to the stomach ([Fig. 1]). Because of the presence of severe anemia, the patient underwent distal gastric resection. SIRT-associated gastrointestinal side effects are mainly diagnosed with the help of biopsies revealing pathognomonic microspheres. Endoscopists and pathologists should be aware of the findings in connection with this new therapy as well as its complications.

Fig. 3 Endoscopic image of the unchanged antral ulceration and severe mucosal inflammation in the lesser curve after 2 months of proton pump inhibitor therapy and 4 months after selective internal radiation therapy (SIRT).

Fig. 4 Endosonographic image of the antral ulceration with a hyperechogenic line on the ulcer base (white arrow) and hypoechogenic tissue in the thickened submucosal layer (black arrow) 4 months after selective internal radiation therapy (SIRT).

Fig. 5 Biopsy showing two round black ⁹⁰Y-microspheres within the capillaries at the ulcer base and associated regenerative mucosal changes of chemical-reactive type (hematoxylin and eosin stain).

Endoscopy_UCTN_Code_CCL_1AB_2AD_3AC

Competing interests: None

• References

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• 4 Ogawa F, Mino-Kenudson M, Shimizu M et al. Gastroduodenitis associated with yttrium 90-microsphere selective internal radiation: An iatrogenic complication in need of recognition. Arch Pathol Lab Med 2008; 132: 1734-1738