A 52-year-old man was referred to an in-patient dentofacial department with complaints of pain in the submandibular area, aggravating during eating. Anamnesis states frequent exacerbations of inflammatory processes. Main and additional investigations resulted in provisional diagnosis of submandibular sialolithiasis. A concrement 1,5 cm in diameter is localized in the body of the gland. What tactics should a dental surgeon choose?