The clinical data of two adolescents with unilateral nasal cavity neoplasm were analyzed.Both were male,one was 14-year-old and the other was 17.Both were complained of unilateral nasal obstruction and nasal discharge;The course of disease of the former was one month,and that of the latter was three month;both were found neoformation in unilateral nasal cavity in medical examination.Occupying lesion in unilateral nasalcavity and sinus were demonstrated in CT scan of two cases.Endoscopy surgery were operated in both cases,incisal opening in labiogingival groove was added in the latter.Pathology of the former was capillary hemangioma and the latter was rhabdomyosarcoma.No findings indicating recurrence has been observed in two cases under 6 months follow-up.Recognition at nasal cavity and paranasal sinus neoplasm in adolescent is essential so thatproper management can be initiated. Abstract:Summary The clinical data of two adolescents with unilateral nasal cavity neoplasm were analyzed.Both were male,one was 14-year-old and the other was 17.Both were complained of unilateral nasal obstruction and nasal discharge;The course of disease of the former was one month,and that of the latter was three month;both were found neoformation in unilateral nasal cavity in medical examination.Occupying lesion in unilateral nasalcavity and sinus were demonstrated in CT scan of two cases.Endoscopy surgery were operated in both cases,incisal opening in labiogingival groove was added in the latter.Pathology of the former was capillary hemangioma and the latter was rhabdomyosarcoma.No findings indicating recurrence has been observed in two cases under 6months follow-up.Recognition at nasal cavity and paranasal sinus neoplasm in adolescent is essential so thatproper management can be initiated. The clinical data of two adolescents with unilateral nasal cavity neoplasm were analyzed.Both were male, one was 14-year-old and the other was 17.Both were complained of unilateral nasal obstruction and nasal discharge; The course of disease of the former was one month, and that of the latter was three months; both were found neoformation in unilateral nasal cavity in medical examination. Occupy lesion in unilateral nasalcavity and sinus were demonstrated in CT scan of two cases. Endoscopy surgery were operated in both cases, incisal opening in labiogingival groove was added in the latter. Pathology of the former was capillary hemangioma and the latter was rhabdomyosarcoma. No law indicating the recurrence has been observed in two cases under 6 months follow-up. Recognition at nasal cavity and paranasal sinus neoplasm in adolescent is essential: that thatproper management can be initiated. Abstract: Summary The clinical data of two adolescents with unilateral nasal cavity neoplasm were analyzed.B oth were male, one was 14-year-old and the other was 17.Both were complained of unilateral nasal obstruction and nasal discharge; The course of disease of the former was one month, and that of the latter was three month; both were found neoformation in unilateral nasal cavity in medical examination. Occupy lesion in unilateral nasalcavity and sinus were demonstrated in CT scan of two cases. Endoscopy surgery were operated in both cases, incisal opening in labiogingival groove was added in the latter. Pathology of the former was capillary hemangioma and the latter was rhabdomyosarcoma. No study indicating recurrence has been observed in two cases under 6months follow-up. Recognition at nasal cavity and paranasal sinus neoplasm in adolescent is essential so thatproper management can be initiated.