Unusual localization of an unusual tumor: calcifying pseudoneoplasm of the foramen magnum

We report a rare case of calcifying pseudoneoplasm in the foramen magnum. A large variety of tumors can be found in the foramen magnum; meningiomas, neurofibromas, chordomas, chondrosarcomas and metastases are among those that have been reported. Based on the histopathological structure of the tumor, radical excision or, in the case of tumors with good behavioral pattern, only decompressive debulking can be applied, in an effort to avoid unnecessary morbidities. Thus, it is important to know the nature of the tumor before planning the surgery.

A 53-year-old man with a 1-year history of pain on the left side of his face was admitted to our service. Magnetic resonance imaging revealed a calcific mass at the left side of the spinal cord at the level of the foramen magnum. Median suboccipital craniectomy and total tumor resection were performed and there was no additional neurological deficit postoperatively.

We report, to our knowledge, the second case of a calcifying pseudoneoplasm of the foramen magnum. We emphasize that these tumors are pathologically benign and do not require aggressive surgical treatment and suggest that asymptomatic cases can be followed radiologically.