A malignant biphasic neoplasm consisting of an epithelial (squamous) element and mesenchymal component is known as a carcinosarcoma (also known as pleomorphic carcinoma, spindle cell carcinoma, pseudosarcoma
, and pseudosarcomatous squamous cell carcinoma) [1, 2] although the exact nomenclature and subclassifications are variable .
SPINDLE CELL CARCINOMA (PSEUDOSARCOMA
OR SARCOMATOID CARCINOMA)
 Since these tumours consist of admixtures of both classical squamoid and spindle shaped sarcomatoid cells, different terms such as carcinosarcoma, metaplastic carcinoma, pseudosarcoma
, sarcomatoid carcinoma, spindle cell carcinoma are used to describe them.
Melanoma in which spindle cells predominate has been termed "pseudosarcoma
Malignant tumours simulating AAM include mixed mesodermal tumours, malignant fibrous histiocytomas, botyroid pseudosarcoma
, embryonal rhabdomyosarcomas squamous cell carcinomas and extramucosal anal adenocarcinomas.
Liposarcomas have to be differentiated from benign entities such as a true lipoma or, in our patient with a BMI of 61, pseudosarcoma
of the morbidly obese.
Since then, it has also been called pseudosarcoma
, spindle cell carcinoma, and sarcomatoid carcinoma.
Carcinosarcoma is sometimes called by several other names (pseudosarcoma
, sarcomatoid carcinoma, pleomorphic carcinoma, and pseudocarcinosarcoma), not all of which are correct.
(72,82,139-150) We prefer the term inflammatory myofibroblastic tumor, which encompasses a variety of terms in the literature, including inflammatory pseudotumor, pseudosarcomatous myofibroblastic tumor, inflammatory pseudosarcomatous fibromyxoid tumor, and fibromyxoid pseudotumor; this term is reflective of the low-grade nature of this lesion and does not incite the same alarm and confusion as the terms that include pseudosarcoma
Cutaneous carcinosarcomais a biphasic malignant tumor made up of both epithelial and mesenchymal components, (2,5,6,11,13,14) Our review of the literature revealed a lack of consensus regarding terminology, as this entity is variously referred to as spindle-cell carcinoma, sarcomatoid carcinoma, metaplastic carcinoma, and pseudosarcoma
Sarcomatoid carcinoma (so-called pseudosarcoma
) of the larynx simulating malignant giant cell tumor of soft parts: a case report.