My mother had surgery to remove the gallbladder ...

Ola Doctor, my mother had surgery to remove the gall bladder, because she had stones. After removal, the gallbladder was sent for biopsy and the result was as follows: MATERIAL EXAMINED - BILIARY VESICLE AND PERICISTIC LYMPHONOD. CONCLUSION - CHRONIC COLECISTITE, CHRONIC LYMPHADENTIS WITH SINUSAL HISTIOCYTOSIS. I would be very grateful if you would explain to me what this is, because my mother will return to the doctor only a month from now, and we are a little worried, we wonder if this is serious? thank you very much!