Case Series
 
Chondroid lipoma, a rare lipomatous tumor: Report of two cases
Mohamed A Shawarby1, Maissa N El-Maraghy2, Ragaa A Salem2, Nafissa M El-Badawy2, Tarek M El-Sharkawy3, Tarek M Hashem3, Ahmad S Kamel3
1College of Medicine, University of Dammam, Dammam, Saudi Arabia.
2College of Medicine, Ain-Shams University, Cairo, EGYPT.
3College of Medicine, University of Dammam, Dammam, Saudi Arabia.

doi:10.5348/ijcri-2013-10-372-CS-1

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How to cite this article:
Shawarby MA, El-Maraghy MN, Salem RA, El-Badawy NM, El-Sharkawy TM, Hashem TM, Kamel AS. Chondroid lipoma, a rare lipomatous tumor: Report of two cases. International Journal of Case Reports and Images 2013;4(10):527–531.


Abstract
Introduction: Chondroid lipoma is a rare, benign lipomatous tumor that may be mistaken histologically for a liposarcoma or chondrosarcoma. Herein, two cases of chondroid lipoma are reported in two Egyptian females aged 38 and 51 years and literature about this rare tumor briefly reviewed with discussion of diagnostic criteria that may help distinguish it from other tumors with overlapping histologic features.
Case Report: The tumor was subcutaneous in both cases. One was located in the right knee area, the other in an infra-mammary location on the right side of the chest. Grossly, both neoplasms were encapsulated and exhibited a nodular, myxoid cut surface. Histologically, they consisted of an abundant myxoid and chondroid stroma interspersed by small round cells with eosinophilic or vacuolated cytoplasm, signet ring lipoblast-like cells, adipocytes and foci of mature adipose tissue. Immunohistochemically, diffuse reactivity of the neoplastic cells for vimentin and variable reactivity for S-100 protein were present in both cases. One case also showed focal immunoreactivity for CD68. The Ki67 proliferative index was less than 5%. The common differentials like myxoid liposarcoma and extraskeletal myxoid chondrosarcoma were ruled out based mainly on pure histologic criteria. Both patients underwent simple curative excision and were tumor free for at least one and three years after surgery, respectively.
Conclusion: Because chondroid lipoma is easily misdiagnosed as a sarcoma of either adipose tissue or cartilage, a high level of suspicion by the pathologist and familiarity with its features are of practical importance to avoid misdiagnosis and overtreatment.

Keywords: Chondroid, Myxoid, Liposarcoma, Chondrosarcoma, Lipoma


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Author Contributions:
Mohamed A Shawarby – Substantial contributions to conception and design, Acquisition of data, Analysis and interpretation of data, Drafting the article, Revising it critically for important intellectual content, Final approval of the version to be published
Maissa N El-Maraghy – Acquisition of data, Revising it critically for important intellectual content, Final approval of the version to be published
Ragaa A Salem – Acquisition of data, Revising it critically for important intellectual content, Final approval of the version to be published
Nafissa M El-Badawy – Acquisition of data, Revising it critically for important intellectual content, Final approval of the version to be published
Tarek M El-Sharkawy – Acquisition of data, Revising it critically for important intellectual content, Final approval of the version to be published
Tarek M Hashem – Acquisition of data, Revising it critically for important intellectual content, Final approval of the version to be published
Ahmad S Kamel – Acquisition of data, Revising it critically for important intellectual content, Final approval of the version to be published
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Authors declare no conflict of interest.
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© Mohamed A Shawarby et al. 2013; This article is distributed the terms of Creative Commons attribution 3.0 License which permits unrestricted use, distribution and reproduction in any means provided the original authors and original publisher are properly credited. (Please see Copyright Policy for more information.)