{Reference Type}: Case Reports {Title}: Case Study: Rare Case of Mantle Cell Lymphoma With Extranodal Involvement in the Foot. {Author}: Fu P;Mercado D;Malezhik V;Mannan AASR; {Journal}: J Foot Ankle Surg {Volume}: 56 {Issue}: 5 {Year}: Sep 2017 0 {Factor}: 1.345 {DOI}: 10.1053/j.jfas.2017.04.019 {Abstract}: Mantle cell lymphoma (MCL) is a rare type of non-Hodgkin lymphoma that commonly affects extranodal sites. The most commonly affected sites are the bone marrow, gastrointestinal tract, Waldeyer's ring, lung, and pleura. We report the case of an 80-year-old diabetic male, in MCL remission, who presented with a small dome-shaped nodule on his calf and an ipsilateral second digit non-healing ulceration after a traumatic fall. Despite surgical and conservative treatment, the wound worsened, resulting in histopathologic examination, which confirmed the presence of lymphocytes, indicating MCL relapse. This case was followed up for approximately 3 months until the patient died. Our case is an example of pedal manifestations of skin involvement of MCL, which, on consideration of the clinical manifestations also, can be confused with a nonhealing diabetic wound. The clinical significance of our case study is to assist in the diagnosis, management, and prognosis of a patient with MCL.