Magnetic resonance imaging (MRI) demonstrated initially L4/5 foraminal narrowing that was believed to be the cause for the patient's symptoms; however, a nerve root block led to no improvement in symptoms.  MRI was repeated at 5 months and demonstrated a mass causing compression of the S1 nerve.  MRI at 14 months subsequently showed rapid growth of the lesion suggestive of an aggressive process such as a metastatic lesion or even a nerve sheath tumor such as a Schwannoma. 
MRI
Magnetic resonance imaging (MRI) demonstrated initially L4/5 foraminal narrowing that was believed to be the cause for the patient's symptoms; however, a nerve root block led to no improvement in symptoms.  MRI was repeated at 5 months and demonstrated a mass causing compression of the S1 nerve.  MRI at 14 months subsequently showed rapid growth of the lesion suggestive of an aggressive process such as a metastatic lesion or even a nerve sheath tumor such as a Schwannoma. 
MRI
Magnetic resonance imaging (MRI) demonstrated initially L4/5 foraminal narrowing that was believed to be the cause for the patient's symptoms; however, a nerve root block led to no improvement in symptoms.  MRI was repeated at 5 months and demonstrated a mass causing compression of the S1 nerve.  MRI at 14 months subsequently showed rapid growth of the lesion suggestive of an aggressive process such as a metastatic lesion or even a nerve sheath tumor such as a Schwannoma. 
MRI