en Gamma Knife Radiosurgery Case report <p style="text-align: justify;"><strong>Background and Importance:</strong> Inflammatory pseudotumors are benign tumors-like lesions of unknown cause. The most familiar sites&nbsp;for inflammatory pseudotumors are the orbit and respiratory tract. An inflammatory pseudo tumor of costo-vertebral junction is rare.<br> <strong>Case Presentation:</strong> We presented here a 50-year-old male with two month history of progressive left cervico-brachial pain. The MRI&nbsp;showed an expansive process at the left costo-vertebral gutter with epidural extension through the lateral foramen, causing spinal cord&nbsp;compression from C7 to D3. The thoraco-abdominal CT scan did not identify other lesions.<br> <strong>Conclusion:</strong> The inflammatory pseudotumor is a chronic inflammatory process of unknown origin. The location of the costo-vertebral&nbsp;gutter is rare and the treatment involves surgery, steroids and radiotherapy.</p> Inflammatory Pseudotumor, Inflammatory Myofibroblastic Tumor, Magnetic Resonance Imaging, Costo-vertebral Junction, Bio psy 25 27 http://irjns.org/browse.php?a_code=A-10-99-7&slc_lang=en&sid=1 Mourouj Mahfoudh موروج محفوظ Mourouj-mahfoudh@yahoo.com 10031947532846002215 10031947532846002215 Yes Intern of Neurosurgery, Sahloul Hospital, Department of Neurosurgery, Sousse, Tunisia Iadh Ksira 10031947532846002216 10031947532846002216 No Assistant Professor of Neurosurgery, Sahloul Hospital, Department of Neurosurgery, Sousse, Tunisia Hichem Ben Selma هیچم بن سلما 10031947532846002217 10031947532846002217 No Professor of Neurosurgery, Sahloul Hospital, Department of Neurosurgery, Sousse, Tunisia Abdelhafidh Slimane عبدالحفیظ اسلیمان 10031947532846002218 10031947532846002218 No Intern of Neurosurgery, Sahloul Hospital, Department of Neurosurgery, Sousse, Tunisia Skander Korbi اسکندر کوربی 10031947532846002219 10031947532846002219 No Assistant Professor of Anatomopathology, Farhat Hached Hospital, Department of Anatomopathology, Sousse, Tunisia Hamouda Guesmi حمودا گوئسمی 10031947532846002220 10031947532846002220 No Professor of Neurosurgery, Sahloul Hospital, Department of Neurosurgery, Sousse, Tunisia Hedi Krifa هدی کریفا 10031947532846002221 10031947532846002221 No Professor of Neurosurgery, Sahloul Hospital, Department of Neurosurgery, Sousse, Tunisia