原发性问外浆母细胞瘤（PEP）是少见肿瘤。它由发生在骨田外非典型增生的浆细胞组成而无多发性骨国癌的证据。最常见的发生部位是上呼吸道粘膜下层组织，尤其是鼻、鼻窦和鼻咽部。发生于中耳的PEP尚未见报道。患者男性，34岁，左耳鸣1年伴听力丧失，耳内填塞感及头痛就诊。局部 Primary foreign plasmablastoma (PEP) is a rare tumor. It consists of atypical hyperplasia outside the bone marrow plasma cells without multiple bone cancer evidence. The most common site of occurrence is the upper respiratory submucosa, especially the nose, sinuses, and nasopharynx. PEP in the middle ear has not been reported yet. Male patient, 34 years old, left tinnitus 1 year with hearing loss, ear filling and headache treatment. Partial