Primary adenoid cystic carcinoma in the lung: report of two cases and therapeutic considerations.

Primary adenoid cystic carcinoma in the lung is an uncommon disease, which is regarded as a slow growing low-grade malignancy. However, this disease has a high risk of incomplete resection because of its unique histological invasion patterns. The cases of two patients who recently underwent surgery for adenoid cystic carcinoma in the lung are reported. Both patients received postoperative radiotherapy treatment as a follow-up to a histologically incomplete resection. Both patients have survived for 51 months and 7 months, respectively, with no recurrence. Postoperative radiotherapy is an acceptable treatment of choice to control residual lesions and provides long-term survival even in cases of incomplete resection.