الملخص الإنجليزي
Primary gastric yolk tumours are extremely rare. We report a 52-year-old male who presented to the
Sultan Qaboos University Hospital, Muscat, Oman, in 2017 after having undergone a gastrectomy abroad due to
a suspected poorly-differentiated adenocarcinoma. The patient subsequently returned to Oman to receive chemo therapy. However, while undergoing chemotherapy, an abdominal computed tomography scan revealed a lobulated
mesenteric mass. Microscopic examination of the resected lesion confirmed a diagnosis of a yolk sac tumour. The
mass was diffusely positive for α-fetoprotein (AFP) and a gastric carcinoma stain was negative. Gastrectomy slides
from the patient's previous surgery were examined retrospectively. The morphology was typical for a yolk sac
tumour and was negative for epithelial markers. An AFP stain showed diffuse immunoreactivity. Thus, the patient was
deemed to have had a primary gastric yolk sac tumour which had later metastasised to the mesocolon. Germ cell
tumour protocols were initiated and the patient responded well to treatment.
