Carpal Tunnel Syndrome: This condition is a common cause of numbness and tingling in the hand, particularly in the dorsal aspect, due to compression of the median nerve at the wrist. The patient's age and the symptom location make this a highly plausible diagnosis.

Radial Neuropathy: Damage to the radial nerve can cause numbness and tingling on the back (dorsal side) of the hand, which aligns with the patient's symptoms. This could be due to compression or trauma.
Cervical Radiculopathy: Nerve root compression in the cervical spine can lead to numbness and tingling in various parts of the hand, including the dorsal aspect, depending on which nerve root is affected.
Ulnar Neuropathy: Although more commonly associated with symptoms in the little and ring fingers, ulnar nerve damage can sometimes cause more widespread numbness and tingling, including the dorsal hand.

Multiple Myeloma: A type of blood cancer that can cause nerve damage leading to numbness and tingling. Given the patient's age, it's crucial to consider this diagnosis to avoid missing a potentially life-threatening condition.
Vitamin B12 Deficiency: Can cause neurological symptoms including numbness and tingling in the hands and feet. This condition is important to identify as it is treatable with supplementation.
Diabetes Mellitus: Diabetes can cause peripheral neuropathy, leading to numbness and tingling in the hands and feet. Early diagnosis and management can prevent further complications.

Sarcoidosis: A condition that can cause nerve damage and lead to numbness and tingling. It's less common but should be considered if other diagnoses are ruled out.
Lyme Disease: In its later stages, Lyme disease can cause neurological symptoms, including numbness and tingling, although this would be an uncommon presentation.
Amyloidosis: A group of diseases that can cause nerve damage leading to numbness and tingling. Given its rarity and the patient's age, it's a less likely but possible diagnosis.