Dedifferentiated Liposarcoma: A Rare Entity

Authors

  • Shahnaz Bano Department of Pathology, Chhattisgarh Institute of Medical Sciences, Bilaspur, Chhattisgarh, India
  • Bhanu Pratap Singh Department of Pathology, Chhattisgarh Institute of Medical Sciences, Bilaspur, Chhattisgarh, India
  • Ankita Gupta Department of Pathology, Chhattisgarh Institute of Medical Sciences, Bilaspur, Chhattisgarh, India

DOI:

https://doi.org/10.21276/apalm.3386

Keywords:

Dedifferentiated Liposarcoma, Pleomorphic Liposarcoma, Lipogenic, Non-lipogenic

Abstract

Background: Dedifferentiated liposarcoma is defined as well-differentiated liposarcoma juxtaposed to areas of high-grade non-lipogenic sarcoma, usually resembling fibrosarcoma or undifferentiated pleomorphic sarcoma. The retroperitoneum is a common site; fewer than 20% of dedifferentiated liposarcomas occur in the head, neck, and rarely in the subcutis.

Case History: A 36-year-old male patient presented to the surgery department of our hospital with the chief complaint of a recurrence of a soft tissue mass over the left upper shoulder region. There is a history of a previous operation at the same site. In the MRI report, a well-defined lobulated lesion was noted in the subcutaneous plane over the left scapular region. The lesion is heterogeneously hyperintense on T2 and STIR and shows areas of cystic changes. A single globular skin-covered specimen measuring 10 x 6.0 x 5.0 cm. The outer surface of the skin is smooth, shiny, and varies in color from grey-white to grey-brown, with the lesion protruding from the skin (FIG 1). On the cut surface, a grayish, shiny, smooth, and cystic appearance is present. Multiple sections studied from the lesional tissue show both well-differentiated liposarcomatous and non-lipogenic (dedifferentiated) components. The liposarcomatous area consists of mature adipocytes and atypical spindle cells. Non-lipogenic components consist of highly cellular areas showing hemangiopericytoma-like vascular patterns, and in some places, malignant fibrous histiocytoma (MFH)-like areas are also noted.

Discussion: Dedifferentiated liposarcoma comprises less than 10% of all liposarcomas. It is found most often in the retroperitoneum and rarely in the extremities, head, and neck region. The incidence is approximately 1 in 330,000 persons per year.

References

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Published

06-10-2024

How to Cite

1.
Bano S, Singh BP, Gupta A. Dedifferentiated Liposarcoma: A Rare Entity. Ann of Pathol and Lab Med [Internet]. 2024 Oct. 6 [cited 2024 Oct. 31];11(10):C139-144. Available from: https://pacificejournals.com/journal/index.php/apalm/article/view/3386

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Section

Case Report