T2-weighted Magnetic Resonance Imaging (MRI) of the lumbar spine presented in two views. The top panel shows a sagittal section illustrating the lumbar vertebrae and intervertebral discs. A prominent disc herniation at the L5-S1 level (white arrowhead) is visible, protruding posteriorly into the spinal canal and causing compression of the thecal sac and cauda equina nerve roots. The bottom panel displays an axial cross-section at the L5-S1 level, further detailing the herniation. The arrow points to a significant left-sided focal protrusion that impinges upon the spinal canal, narrowing the space for neural elements. The high-intensity signal of the cerebrospinal fluid (CSF) in the thecal sac helps delineate the extent of mechanical compression. This diagnostic imaging is characteristic of lumbar radiculopathy secondary to disc prolapse, demonstrating the relationship between degenerative spinal structures and the central neural canal.

This diagnostic image composite features three MRI views of the human lumbar spine, demonstrating multilevel degenerative changes and disc pathology. Panel A is a T2-weighted sagittal MRI showing a loss of disc height and reduced signal intensity at the L4/L5 and L5/S1 levels, consistent with disc dehydration and degeneration. A posterior disc bulge is visible at L5/S1, indenting the thecal sac. Panel B provides a T2-weighted axial cross-section at the L5/S1 level, highlighting a right-sided posterior disc prolapse that causes narrowing of the lateral recess and potential nerve root compression. Panel C presents a coronal view of the abdomen and lumbar spine, illustrating a mild left-sided lateral curvature (scoliosis). Anatomical landmarks such as the kidneys and psoas muscles are visible, with the latter showing slight asymmetry corresponding to the spinal curvature. The study is highly relevant for musculoskeletal radiology and neurosurgery, illustrating common findings in chronic radiculopathy and lumbar disc herniation.

Diagnostic MRI scans of the lumbar spine showcasing degenerative disc disease and associated pathology. Figure A is a T2-weighted sagittal view of the lumbar spine. It demonstrates the vertebral bodies, intervertebral discs, and the spinal canal. Key findings include degenerative bulging at the L4/L5 level and a significant prolapse at the L5/S1 level with loss of disc height. There is visible signal intensity change at the adjacent vertebral endplates, consistent with terminal inflammation or Modic changes. Figure B is a T2-weighted axial view at a lumbar level, likely L5/S1, showing the relationship between the intervertebral disc and the neural structures. The disc demonstrates a posterior protrusion/prolapse that encroaches upon the spinal canal, potentially causing nerve root compression. The CSF-filled thecal sac appears as a bright (hyperintense) triangular region behind the disc, while the surrounding paraspinal musculature and posterior elements are clearly visible. These images serve as educational examples of lumbar disc herniation, discogenic pain, and the use of MRI in assessing mechanical back pain and radiculopathy.

An axial T2-weighted Magnetic Resonance Imaging (MRI) scan of the lumbar spine, specifically at the L4-L5 level. The image provides a clear view of the vertebral body anteriorly and the spinal canal centrally. Pathological findings demonstrate a significant posterolateral disc herniation on the right side. The herniated disc material is seen protruding into the spinal canal, causing a mass effect and resulting in the compression of the right L5 nerve root. This disruption of the normal anatomical symmetry is evidenced by the narrowing of the lateral recess on the right compared to the relatively patent left side. Visible posterior elements include the laminae and paraspinal musculature. This diagnostic image serves as an educational example of degenerative disc disease and acute radiculopathy secondary to mechanical neural compression.

Anatomical diagram depicting a human dermatome map of the lumbosacral and coccygeal regions, shown from a lateral, bent-over perspective to highlight the sensory distribution along the lower extremities and posterior trunk. The illustration uses distinct shading patterns and alphanumeric labels to delineate specific cutaneous areas innervated by individual spinal nerve roots. Key segments include the lumbar dermatomes L1 through L5, sacral dermatomes S1 through S5, and the coccygeal dermatome C1. Visually, L1 covers the inguinal and hip region, L2-L3 transition down the anterior and lateral thigh, and L4-L5 extend down the lower leg to the dorsal foot. Sacral segments S1 and S2 cover the posterior leg and heel, while S3-S5 and C1 are concentrated in the perineal and gluteal regions. This medical illustration is a standard educational tool for neurological examinations, aiding in the localization of spinal nerve root compression or radiculopathy based on sensory loss patterns.

This clinical dermatome map, presented as an anatomical diagram overlaid on a human subject, illustrates the cutaneous sensory distribution of spinal nerves. The anterior trunk displays a sequential horizontal banding pattern representing thoracic dermatomes T2 through T12, with T4 roughly at the nipple line and T10 at the umbilicus. The upper extremities show cervical and upper thoracic distribution: C5 (lateral upper arm), C6 (lateral forearm and thumb), C7 (middle finger), C8 (medial hand and little finger), and T1 (medial forearm and arm). The lower extremity map details the lumbar and sacral levels: L1 (inguinal region), L2 (anterior mid-thigh), L3 (distal thigh and knee), L4 (medial lower leg), L5 (lateral lower leg and dorsal foot), and S1 (lateral foot and small toe). This resource is designed for primary care musculoskeletal medicine to assist in the neurological examination of sensory deficits, radiculopathy, or spinal cord injury level localization.