Imaging findings of gastric glomus tumors.

Sparse literature describes the imaging findings of gastric glomus tumors (GGT), focusing on benign tumors. We are not aware of prior radiology reports on malignant GGT. The aim of the study was to determine whether it is possible to differentiate between benign and malignant GGT on CT or MR. Institutional radiology and pathology databases were queried for the diagnosis of GGT between January 2010 to December 2023. Of 22 identified subjects, five were excluded due to non-availability of preoperative CT or MR images and three due to lack of pathological confirmation in our institution. The study cohort comprised of 14 patients (males = 6) with median age of 65 years (range 31 to 79 years). Two abdominal radiologists in consensus reviewed all relevant CT and MR images. There were 10 benign and 4 malignant GGT. Benign tumors were smaller than malignant GGT (median size of 2.0 cm vs. 5.3 cm, p = 0.03), more likely to exhibit homogeneous hyperenhancement (9/10 vs. 0/4, p < 0.01), and demonstrated intramural rather than exophytic growth. There was no substantial difference in T2 signal or diffusion restriction between benign and malignant GGT. On follow up, benign GGT were essentially stable in size, while malignant GGT grew. A biopsy proven GGT larger than 5 cm or showing necrosis is likely to be malignant. This is important since preoperative endoscopic ultrasound-guided fine needle aspiration may be indeterminate for malignancy.