抄録
Lymphoblastic lymphoma is rare, accounting for 1% of adult malignant lymphoma cases, while lymphoblastic lymphoma derived from B cells comprise only 10% of malignant lymphoma. These lesions occur primarily in head and neck skin, and are frequently associated with bone lesions. We report a case of B-lymphoblastic precursor lymphoma developing in the maxillary sinus of a 29-year-old man initially seen for left buccal pain. Computed tomography showed a homogeneous shadow filling the left maxillary sinus. Based on a diagnosis of acute rhinosinusitis, conservative treatment failed to make any improvement. Suspecting a neoplastic lesion, we opened the maxillary sinus, finding trapped mucopurulent fluid and a granuloma-like lesion was found, which biopsy indicated was malignant lymphoma. More detailed examination yielded a diagnosis of B-lymphoblastic precursor lymphoma, treated as for acute lymphocytic leukemia. Following treatment, the lesion disappeared and no symptoms of recurrence have been seen.
