@article{Qureshi_Al-Moundhri_Al-Shaibi_Al-Haddabi_Mittal_2018, title={Primary Gastric Yolk Sac Tumour}, volume={18}, url={https://journals.squ.edu.om/index.php/squmj/article/view/2864}, DOI={10.18295/squmj.2018.18.03.020}, abstractNote={<p>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 chemotherapy. 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.</p><p><br /><em><strong>Keywords:</strong></em> Yolk Sac Tumor; Germ Cell Tumor; Gastrectomy; Metastasis; Diagnostic Errors; Case Report; Oman.</p>}, number={3}, journal={Sultan Qaboos University Medical Journal}, author={Qureshi, Asim and Al-Moundhri, Mansour and Al-Shaibi, Maha and Al-Haddabi, Ibrahim and Mittal, Alok}, year={2018}, month={Dec.}, pages={e383–385} }