 Hello everyone. Welcome to another case of the month. A 35 years old male patient presented with history of numbness in 4th and 5th digits of left hand. MRI neurography of his left upper limb was asked for. Let us take a look at the relevant images. Axial P1 images with arrows showing the ulnar nerve in distal arm, cubital tunnel and proximal forearm. No obvious lesion is seen along the course of the nerve. Axial T2 fat saturated images, 3D space star images in coronal plane which are extremely useful for the visualization of nerves. These are selected T2 fat sat axial images showing the normal appearance of ulnar nerve in distal arm, irema and hyperintensity starting at the level of medilepicondyle within the cubital tunnel and at proximal forearm. 3D star space images in coronal plane confirming the findings which were seen on axial T2 fat sat images. The MRI findings are suggestive of cubital tunnel syndrome. We went on to do a USG correlation for our interest. These are dynamic images at the level of cubital tunnel starting with elbow in extension and then in flexion. Another set of dynamic USG images as the previous one, static image at the level of cubital tunnel of left elbow in extension showing the normal position of ulnar nerve, medial two triceps and lateral to the medial epicondyle on flexion. Abnormal subluxation of ulnar nerve is seen way beyond the medial epicondyle of humerus. Normal position of triceps tendon is seen lying at the level of medial epicondyle. Structured marked in O is the olocronum process. The ultrasound shows ulnar nerve subluxation which is the likely cause of cubital tunnel syndrome seen on MRI. Cubital tunnel syndrome is a type of ulnar nerve neuropathy due to abnormal compression of the ulnar nerve along its course within the cubital tunnel. Ulnar nerve compression can result in altered sensation in the little and ring fingers and can progress to marked wasting of the small muscles of the hand and the ulnar sighted muscles of the forearm. The cubital tunnel represents one of the several small passages through which the ulnar nerve passes near the elbow and is the most common sight of neuropathy. During normal elbow flexion the ulnar nerve experiences tension and axial compression due to increased pressure within the cubital tunnel up to 20 folds. Any local structural abnormality may exacerbate the mechanical forces on the nerve which may result in neuropathy. MRI findings include ulnar nerve thickening, T2 hyperintensity and denavation edema or atrophy of the flexor carbide ulnaris and flexor digital profundus muscles. On new SG there is ulnar nerve thickening and edematous changes within the nerve. Ulnar nerve subluxation or dislocation is one of the causes of cubital tunnel syndrome. It can also be seen in some normal asymptomatic people. On flexion there is normally some movement of the ulnar nerve towards the epics of the medial epicondyle. Dislocation as is seen in the dynamic USG in our case occurs if there is translation of the ulnar nerve over the medial epicondyle and beyond it. A snap may also be heard or felt with the movement.