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Ulnar neuropathy arises most commonly because of damage to the nerve as it passes through the wrist. The elbow is also a frequent site of nerve damage.

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Hello,

I see you are asking "What is ulnar-mammary syndrome?"

Schinzel syndrome, also known as ulnar-mammary syndrome, is a rare inherited disorder characterized by abnormalities of the bones of the hands and forearms in association with underdevelopment (hypoplasia) and dysfunction of certain sweat (apocrine) glands and/or the breasts (mammary glands)

orthopedicshealth. com/condition/ulnar-mammary-syndrome/c/39134

The most common symptoms of ulnar neuropathy are pain and sensory changes in the fourth and fifth digits of the affected arm. Other symptoms include digit and arm weakness, a weak grip, and pain in the elbow.