Hard, non-painful bump on the back of the head Possible causes

Описание: What are the most likely diagnoses for a hard, painless bump on the occipital region of a 15-year-old?
How does an Occipital Spur differ from an Occipital Osteoma, both clinically and radiologically?
What are the causes, symptoms, and treatments for the various conditions like Occipital Spur, Osteoma, Lipoma, and Osteochondroma?
How can one differentiate between a bone spur and a benign bone tumor such as osteoma on an X-ray or CT scan?
What are the most common locations for the different conditions discussed, and how likely are they to occur in the occipital region?
Important Highlights:

Occipital Spur is an anatomical variant that is a likely diagnosis for a hard, painless bump in the occipital region.
Occipital Osteoma is another possibility but is rarer and typically occurs in adults, with a most common diagnosis around 40 years old.
Lipoma differs significantly from the other conditions due to its soft, fatty nature, unlike the bony protrusions.
Osteochondroma is common among benign bone tumors but is more likely to occur near long bones, making it less likely in the occipital region.
Precise differentiation between Occipital Spur and Occipital Osteoma requires radiological examination and possibly a biopsy, with the Spur being an exaggerated anatomical feature, whereas the osteoma is a benign tumor.


By Hellerhoff - Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index...
By Hellerhoff - Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index...
By Sikander Iqbal, CC BY 3.0, https://commons.wikimedia.org/w/index...