Radiology Teaching Files > Case 3599330

never visited BONE ISLAND
Contributed by: Fritsch & Thompson.

Fig. 1: bone islands in femoral head and in supra-acetabular area

Fig. 2: lateral projection shows bone island in supra-acetabular area

Fig. 3: bone island in the juxta-articular ilium near the lower part of the SI joint
Findings: Homogenous focal areas of increased radiopacity, with round to ovoid shape in the femoral head and supra-acetabular ilium.
Diagnosis: bone islands
Discussion: Typically round to ovoid in shape and less than 1cm in size, bone islands are common in the femoral head/neck area and in the flat bones of the pelvis. They are occasionally worrisome when larger than usual and/or when seen on radiographs of older patients, where blastic metastatic disease is a differential consideration. In younger patients, a solitary bone island can also mimic the reactive sclerosis associated with osteoid osteoma, particularly in the femoral neck.
No comments posted.
Additional Details:

Case Number: 3599330Last Updated: 01-07-2006
Anatomy: Skeletal System   Pathology: Normal/Variants
Modality: Conventional RadiographExam Date: Access Level: Readable by all users
Keywords: enostoma; bone island

The reader is fully responsible for confirming the accuracy of this content.
Text and images may be copyrighted by the case author or institution.
You can help keep MyPACS tidy: if you notice a case which is not useful (e.g. a test case) or inaccurate, please send email to