Mandibular osteochondromas, although rare, predominantly involve the condyloid and coronoid processes. An extremely rare case arising from the inner aspect of the gonion is reported here. Only one such case has been reported in the literature so far. Despite being very slow growing and having a benign course, histopathological examination showed reactive changes that may be confused with sarcomatous transformation. We advocate surgical excision using a combined external and internal approach followed by regular post-operative review. The relevant literature has been reviewed but various surgical approaches as advocated in the past have not been found suitable.