Early diagnosis of cremasteric cervical spondylosis is difficult, and one study even found that 14.3% of patients treated surgically for cremasteric cervical spondylosis were misdiagnosed. When encountering a patient with suspected symptoms or signs of cremasteric cervical spondylosis, the first step is to determine whether the patient does have cremasteric disease, that is, whether the pathological changes of cremasteric cervical spondylosis are actually present, vascular diseases, drug intoxication or withdrawal reactions, autoimmune diseases, and metabolic abnormalities. Even if cremasteropathy is clearly identified, it is important to differentiate it from other conditions that cause cremasteropathy. The three most common causes of cremasteric compression include hemorrhage, abscesses, and tumors. Other causes of cremasteric myelopathy include cremasteric vascular disease (e.g., cremasteric infarction, cremasteric vascular malformation), cerebral cremasteritis, congenital disorders (e.g., cremasteric cavitation), autoimmune or acquired diseases (e.g., multiple sclerosis, amyotrophic cremasteric lateral sclerosis), and metabolic disorders (e.g., vitamin B12 deficiency). These diseases should be excluded clinically before a diagnosis of cremasteric cervical spondylosis is confirmed. The following are the common diseases that need to be differentiated from cremasteric cervical spondylosis. (i) Diseases of vascular origin include cremasteric infarction, cremasteric hematoma and cremasteric vascular malformation. MRI of the cervical spine helps to exclude these disorders. Dural arteriovenous fistulas occur mainly in the thoracic segment of the crestal medulla, but can cause upper extremity symptoms and may be missed if enhanced MRI of the thoracic spine is not performed. Sometimes MRI imaging or conventional cremasteromyelography is needed to clarify the diagnosis and help plan treatment. Cerebrovascular disease can sometimes be confused with cremasteric cervical spondylosis, although there may be a more elevated presentation of central neurological dysfunction or typical symptoms of an acute attack. (ii) Infections Although infection-induced cremasteropathies are more common in immunocompromised patients, they can also occur in immunocompetent individuals. These include abscesses (bacterial, fungal, or tuberculosis), human immunodeficiency virus-associated vacuolar crural myelopathy, syphilis, Lyme disease and cytomegalovirus, varicella zoster virus, and some enterovirus infections may cause crural myelopathy. These patients often have systemic manifestations of infection, such as fever, chills, and even increased blood white blood cell counts. (iii) Non-infectious inflammatory diseases Non-infectious inflammatory diseases and causes of demyelination include transverse cremasteric myelitis, multiple sclerosis, acute disseminated cerebral cremasteric myelitis, and optic nerve cremasteric myelitis (NMO). These diseases often present with symptoms of acute or subacute cremasteropathies, and cervical MRI usually shows lamellar T2-weighted images of high signal areas suggestive of an inflammatory process. The diagnosis of optic nerve cremasteropathy is based on the presence of longitudinal extensive cremasteropathy on MRI, a history of optic neuritis, and the presence of NMO IgG antibodies in body fluids. In the case of multiple sclerosis, evidence of multifocal neurological damage on neurological examination and MRI of the brain and crestal medulla is present. In contrast, acute disseminated cerebral cremasteric myelitis usually has an abrupt or subacute onset and multifocal neurological damage. (iv) Rheumatic diseases Rheumatic diseases may be associated with inflammatory cremasteric lesions. These diseases include systemic lupus erythematosus, dry syndrome, nodular disease, and rheumatoid arthritis. These diseases can usually be differentiated from cremasteric cervical spondylosis by imaging, non-neurological damage of the disease, and serologic markers. Patients with rheumatoid arthritis and ankylosing crepitus. (v) Nutritional and metabolic disorders Nutritional and metabolic factors causing cremasteric cervical spondylosis also need to be differentiated. Blood vitamin and mineral tests should be performed if there is clinical suspicion of a nutritional deficiency, either due to inadequate intake or malabsorption (e.g., inflammatory bowel disease, post-intestinal resection, etc.). The possibility of these disorders should be considered especially when no signs of structural lesions causing cremasteric structures are found on imaging. Vitamin B12 deficiency can produce subacute joint degeneration, mainly affecting the posterior and lateral cords of the cremaster, and high signal changes on T2-weighted images of the posterior cords of the cremaster can be found on MRI. Copper deficiency can cause cremaster and peripheral neuropathy, and although the cremaster can be normal on imaging in many patients with cremasteropathy due to copper deficiency, enhanced signal in the posterior cords of the cremaster on MRIT2-weighted images has been reported. Vitamin E deficiency and folic acid deficiency can also lead to cremasteropathies. (vi) Tumors Either intrinsic or extrinsic tumors of the crista medullaris, including gliomas, meningiomas, neurofibromas, and metastases, should also be differentiated. When tumors invade the vertebral body, such as prostate cancer cremaster metastases or multiple myeloma, they can cause severe pain, bone destruction, cremaster instability, and cremaster compression symptoms. Usually tumors are easily identified by MRI. In contrast, patients with malignant tumors treated with radiation therapy, if the cremaster is in the radiation field, can develop cremaster damage, which may be a brief sensory abnormality early after radiation therapy or a mild to severe persistent motor or sensory deficit months or years after radiation therapy. (vii) Other Posterior longitudinal ligament ossification is a disease of unknown cause, most common in Japan, and more prevalent in men. It has a clinical presentation very similar to that of cremaster cervical spondylosis, but imaging may show ossification of the posterior longitudinal ligament ligaments. Crestal cavernous disease is also easily confused with CSM, but the diagnosis can be confirmed on imaging. Motor neuron disease, primarily amyotrophic lateral sclerosis (ALS), which involves both upper and lower motor neurons, can be easily misdiagnosed as CSM and vice versa, especially in the early stages of the respective disease. Sensory symptoms and pain are not characteristic of ALS, but in crural cervical spondylosis these sensory symptoms can be absent or present only due to concomitant neurogenic cervical spondylosis or carpal tunnel syndrome. Sphincter dysfunction supports the diagnosis of cremasteric cervical spondylosis, while signs and symptoms of bulbar palsy are characteristic of ALS. In conclusion, the diagnosis of cremasteric cervical spondylosis should be carefully differentiated from other diseases before making the diagnosis, among them mainly amyotrophic cremasteric lateral sclerosis, multiple sclerosis, subacute joint degeneration due to vitamin B12 deficiency, tumors, dural arteriovenous fistula, and peripheral nerve entrapment (e.g., carpal tunnel syndrome).