Schmorl's nodule is a radiographic finding seen in:

Schmorl's node (SN) is the herniation of nucleus pulposus (NP) through the cailaginous and bony end plate into the body of the adjacent veebra. They appear as shallow concavities along the superior and inferior endplates of veebral bodies and are often detected incidentally. Ref: Spinal Imaging: Diagnostic Imaging of the Spine and Spinal Cord, edited by Johan W. M. van Goethem, Page 351.