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BMJ Case Rep. 2010; 2010: bcr11.2009.2446.
Published online 2010 April 5. doi:  10.1136/bcr.11.2009.2446
PMCID: PMC3047516
Rare disease

Positive psoas sign in presentation of retroperitoneal malignant triton tumour

Abstract

This article describes a case of a rare malignant neoplasm presenting to the emergency department with common symptomatology and its subsequent identification using a simple physical examination technique. Discussion includes a description of this rare soft tissue sarcoma and a consideration of the value of the psoas sign as a part of the routine abdominal exam to detect intra-abdominal and retroperitoneal pathology. In conclusion, this article acts as a reminder to all clinicians that uncommon and significant pathology may present to the emergency department masquerading as a common, seemingly benign, complaint, but can be clinically identified using simple techniques available to all and rapidly investigated using appropriate special investigations.


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