In most circumstances, it is a misnomer because a mass actually exists, and hence, the term pseudoneoplasm would be more appropriate.
Furthermore, as more knowledge continues to accrue, the classification of pseudoneoplasms presented here will undoubtedly undergo revision.
TOPOGRAPHIC DISTRIBUTION AND BIOLOGIC NATURE OF PSEUDONEOPLASMS
While the pathogenesis of this entity is not well understood, CAT is a clinically important pseudoneoplasm because it often raises high suspicion for malignancy.
It is also germane to the topic of pseudoneoplasms because LHAS results from a developmental aberrancy and is not an acquired neoplasm (lipoma).
Inflammatory fibroid polyp is a rare mesenchymal pseudoneoplasm of the digestive system with unclear histogenesis.
Malakoplakia is the best example of a pseudoneoplasm characterized by an eosinophilic cell infiltrate.
Calcified pseudoneoplasm of the neuraxis (CPN) is a highly distinctive lesion of indeterminate nature.
This is particularly the case when associated with an overlying calcifying pseudoneoplasm of the neuraxis (see above).
Pseudoneoplasm or pseudotumor is defined in the medical dictionary as "a nonneoplastic enlargement that resembles a true neoplasm" or "a circumscribed fibrous exudate of inflammatory origin.
Although the main focus of this article is on pulmonary pseudoneoplasms, pertinent issues on IMT as a neoplasm are also reviewed.
We read the outstanding article by Miller and Tazelaar1 recently published in the Archives of Pathology & Laboratory Medicine about the main features of 5 cardiovascular pseudoneoplasms
(inflammatory myofibroblastic tumor, hamartoma of mature cardiac myocytes, mesothelial monocytic cardiac excrescences, calcified amorphous tumor, and lipomatous hypertrophy of the atrial septum).