Trigger finger due to phalangeal osteochondroma of an adult: A case report.

Trigger finger is stenosing tenosynovitis that occurs in A1 pulley. It usually occurs idiopathically in patients' 40s and 50s. On the other hand, pediatric trigger finger usually occurs before 8 years old in pediatric patients. Even though being rare, a tumor occurred in the soft tissue or bone near flexor tendons can cause a trigger finger. Trigger finger due to osteochondroma is very rare. Furthermore, most cases of trigger finger due to osteochondroma occur in pediatric patients with hereditary multiple osteochondromatosis (HMO). The authors report this case of a trigger finger caused by a solitary osteochondroma that occurred in the proximal portion of the proximal phalanx of the left middle finger, of a 21-year-old patient. The symptoms were relieved after excision of the osteochondroma. If a patient with unusual demographics visits, the cause of trigger finger may not be idiopathic. Evaluation methods such as x-rays and ultrasonography can be helpful to rule out other causes, such as tumors.