Published online by Cambridge University Press: 01 March 2011
This chapter includes a variety of non-neoplastic lesions that can form tumor-like masses or histologically simulate a neoplasm. Among these are histiocytic reactions to apparently noninfectious stimuli (e.g., granuloma annulare, pulse granuloma) and infections (e.g., mycobaterial pseudotumor, malakoplakia, and xanthogranulomatous reaction to infection). Accumulation or retention of foreign material can cause tumor-like reactive masses (e.g., retained cotton sponge), or microscopically can simulate a tumor, such as mucinous or signet ring cell carcinoma or chordoma (polyvinylpyrrolidone storage in histiocytes). Another example of permanently retained diagnostically used material is thorotrast, a historically used radioactive contrast medium associated with fibrous tumors at injection sites and hepatic malignancies. In the case of gadolinium-associated fibrosis, the fibrous reaction is visible, whereas the causative agent is not microscopically detectable. Finally, amyloid tumor is discussed here, including its variants associated with systemic amyloidosis and lymphoplasmacytic lymphoma (immunoglobulin light-chain–derived amyloidosis).
ORGANIZING HEMATOMA
Soft tissue hematoma can form a long-standing and expanding tumor-like mass that clinically, radiologically, and even pathologically sometimes simulates a neoplasm. Such lesions have been variably referred to as post-traumatic cyst of soft tissue, chronic expanding hematoma, and ancient hematoma. Calcified myonecrosis is a related term, with this condition also including a significant component of muscular necrosis and often developing after conditions such as compartment syndrome.
Clinical Features
Organizing hematoma can develop in a variety of soft tissue sites that most commonly include the thigh, abdominal wall, and chest wall.
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