Learning Objectives 
1.	Review the differential diagnosis of intradural cystic-like lesions at the lumbar level. 
2.	Establish a differential diagnostic approach based on imaging patterns. 
3.	Discuss neurenteric cyst of the spine. 
4.	Present a rare case of bronchial endodermal cyst of the cauda equina. 

Background 
Neurenteric cysts are rare spinal axis tumors, only accounting for 0.7-1.3%. They usually occur in the lower cervical and upper thoracic spine 1. 90% are located in the intradural or extramedullary compartment. Individuals typically present in the 2nd and 3rd decade of life with a 2:1 male to female ratio. They are formed by displaced elements of the gastrointestinal or respiratory tract during embryogenesis. Histology is required to delineate the subtype of the neurenteric cyst. 

Material and Method 
We present a rare case of a 48 years old female patient presenting with back pain. The MRI demonstrated a complex intradural cyst mass at the L1 level, located along the posterior aspect of the conus medullaris. The lesion was resected and the diagnosis of intradural bronchial endodermal cyst was made by neuropathology. 

Discussion and Conclusions 
Intradural cysts or mixed cystic lesion of the conus medullaris and cauda are relatively uncommon. The differential diagnoses of cystic or mixed solid and cystic lesion in this location includes: 
-	Myxopapillary ependymoma 
-	Epidermoid 
-	Schwannoma 
-       Dermoid 
-	Dilatation of the 5th Ventricle 
-	Neurenteric cyst 

The aim of our presentation is the provide description of the various pathologies, outlining their characteristics and imaging patterns and provide a pictorial review of these entities. In particular the rare neurenteric cyst pathogenesis and imaging characteristics will be presented.

Rare Case of a Bronchial Endodermal Cyst of the Cauda Equina: Literature Review and Strategic Imaging Approach