[Primary peripheral T-cell lymphoma of the vagina incidentally found at cervical cancer screening].

A 50-year-old woman was referred to our hospital because a mass lesion had been palpable through the vaginal wall during a cervical cancer screening examination. A contrast-enhanced computed tomography (CT) scan and magnetic resonance imaging (MRI) revealed marked thickening of the vaginal wall, constituting a mass 96 mm in diameter. Abnormal FDG uptake was observed in the vaginal mass, but no other lesions were detected by positron emission tomography (PET/CT). A transvaginal biopsy from the tumor revealed peripheral T-cell lymphoma, not otherwise specified (PTCL-NOS). Although endoscopic examinations revealed no signs of infiltration in either the bladder or the rectum, the MRI findings suggested invasion into the adjacent rectal wall. She achieved complete remission after six courses of biweekly THP-COP therapy, to which field radiation (39.6 Gy) was added. PTCL of the vagina is rare and this case therefore merits description in the literature.