RESUMEN
1) All students but 1 correctly typed the ABO blood groups, but only 33.2% of students and 63.9% of physicians properly performed cross-matching.<br>2) Most failures in cross-matching were due to the inability to detect allogeneic antibodies, but 5.2% of students and 2.9% of physicians failed to detect ABO mismatching.<br>3) Although laboratory practice is suggested to help students to solidify knowledge and comprehend principles, achieving an official goal of residency - gaining competence in performing and interpreting cross-matching independently - appeared difficult.
RESUMEN
Schwannoma is a benign neoplasm originating from the neural sheath and occurs most commonly in the soft tissues of the head and neck. Intraosseous schwannoma in the maxillofacial region is extremely rare. The present study reports the case of an intraosseous schwannoma located in the mandibular symphysis of a 27-year-old male patient. The tumor was completely excised, and there has been no evidence of recurrence in the nearly two years since the operation. A review of the related literature is also included.