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- confusion con quistes ovaricos y Dx    The diagnostic tests include several imaging studies, plain radiograph shows the curved appearance of the residual sacrum, scalloped beneath the defect with an appearance of scimitar sacrum, is considered as an almost pathognomonic finding, and is present in 50% of cases.\cite{3335662} Abdominal ultrasound is usually the first test performed, it reveals the presence of the intra-abdominal cystic abnormality, careful examination should be made to avoid misdiagnosis as an ovarian cyst as happened with our patient, and has been described in other reports.\cite{16673368}\cite{23486628} > ultrasound, myelography, barium enema, CT, excretory urography, and MRI.  > ASM is seen as a fluid-filled cyst via US and . US ... Ultrasound  may also have a role in the follow up of the size changes in cystic masses. CT is CT-scans are  useful to display bony anomalies and erosions and CSF density within the cyst [6]. erosions[6].  Intrathecal contrast enhanced CT scanning is the diagnostic procedure of choice, sinceit not only  demonstrates the communication between the meningocele and the subarachnoid space but also usually demonstrates associated tumors if they cause filling defects spaces  [13]. However, this method is invasive and has the disadvantage of ionizing radiation. MRI is a safe, rapid, and noninvasive imaging method with multiplanar imaging capability, and it can also show any associated small tumors.Accurate information of the shape, size, anatomical relations to the surrounding organs, and internal characteristic of the cystic mass may be obtained with routine MRI without introduction of contrast material into the spinal canal  [13].MRI is capable of showing characteristic CSF intensity within the cyst, without the need for intrathecal contrast material. MRI can provide nearly all the information derived from CTmyelography, an exception may be demonstration of subarachnoid communication in small-necked lesion [14].  - approaches