Presentation
Left loin pain. Plain radiograph and ultrasound of the abdomen were requested.
Patient Data
Left renal stone. Incidentally noted abnormality at the left iliac fossa.
Frontal view demonstrated three bones, shaped like phalanges with pseudoarticulation in between. Lateral view confirmed the findings. The appearance is pathognomonic of a pelvic digit.
Case Discussion
Pelvic digit is a rare congenital anomaly, which is usually an incidental radiology finding at imaging done for another purpose. Pelvic digits have been reported close to the ileum, ischium, hips, lower ribs and abdominal wall 1. As mentioned, they are usually incidental finding, however few case reports of symptomatic pelvic digits, mainly in proximity to the hip joint, are published. Diagnosis is made by recognition of phalanges-like, well-corticated bones having variable pseudo-articulation in between 2.3. The presence of carpal and metacarpal-like bones has also been described. Usually X-ray is enough, but CT, especially with 3D images, would be helpful when appropriate. It is important to identify pelvic digit as an example of "Do not touch lesion".