PURPOSE:: To identify the incidence of radiologically and histologically documented bony invasion of the lacrimal gland fossa by adenoid cystic carcinoma. PATIENTS AND METHODS:: The authors reviewed the records of all 18 patients with lacrimal gland adenoid cystic carcinoma surgically treated at their institution from 1997 to 2009 for imaging findings (blinded review) and histologic findings on evaluation of the lacrimal gland fossa. Preoperative CT and/or MRI findings were available for 17 patients. RESULTS:: The 8 men and 10 women ranged in age from 9 to 69 years. American Joint Committee on Cancer tumor stages after preoperative imaging were as follows: T1N0M0, 2 patients; T2N0M0, 5 patients; T3aN0M0, 2 patients; T3bN0M0, 5 patients; T3bN0M1, 2 patients; T4bN0M0, one patient; and TxN0M0, one patient. Preoperative imaging suggested bony involvement of the lacrimal gland fossa in 13 patients (76.5%); this was histologically confirmed in 11 of the 13. Preoperative imaging suggested no bone involvement in 4 patients, 3 of whom had bone involvement by histology. Overall, 14 of 17 histologically evaluable cases (82.3%) had invasion of the lacrimal gland fossa. Histologic findings of bone/periosteal involvement led to upstaging of 3 tumors. Metastases developed in 8 of 18 patients and trended with basaloid histology (p = 0.066). CONCLUSIONS:: Adenoid cystic carcinoma of the lacrimal gland is associated with bone invasion in essentially all but the smallest of tumors (T1). This high rate of bone involvement may warrant addressing the bony walls during surgery for adenoid cystic carcinoma of the lacrimal gland.
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