Osteoma

Osteoma is a benign chondro-osseous tumour that may be seen in the context of familial adenomatous polyposis.

Osteoma
Diagnosis in short
Benign bone consistent with osteoma. H&E stain.
LM	benign (normal) bone
LM DDx	normal bone
Site	bone
Syndromes	familial adenomatous polyposis
Prevalence	common
Prognosis	benign
Treatment	excise if symptomatic or growing

It should not be confused with osteoid osteoma.

General

• Benign.
• May be associated with familial adenomatous polyposis.
• Normal bone - unusual location/outgrowth.

Microscopic

Features:

• Normal bone.

Note:

• Correlation with radiologic findings is essential.

Images

• 

  Osteoma - very low mag.

• 

  Osteoma - low mag.

• 

  Osteoma - intermed. mag.

• 

  Osteoma - high mag.

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Submitted as "Left Frontal Skull Tumour", Excision:
- Benign bone, compatible with osteoma.

See also

• Chondro-osseous tumours.