pseudotumor


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pseudotumor

 [soo″do-too´mer]
an enlargement that resembles a tumor; it may result from inflammation, accumulation of fluid, or other causes, and may or may not regress spontaneously.
pseudotumor ce´rebri cerebral edema and raised intracranial pressure without neurological signs except occasional sixth-nerve palsy.
inflammatory pseudotumor a tumorlike mass resulting from an inflammatory reaction; it may occur in a variety of organs and is composed of granulation tissue with leukocyte infiltration.

phan·tom tu·mor

accumulation of fluid in the interlobar spaces of the lung, secondary to congestive heart failure, radiologically simulating a neoplasm.

pseudotumor

Any circumscribed, nonneoplastic tumor-like mass–eg, gastric inflammatory fibroid polyps, a wad of helminths–eg, Strongyloides species–seen in Uganda, 'amyloidomas', endometriomas or other mass lesions. See Inflammatory pseudotumor. Cf Tumor Ophthalmology Inflammatory pseudotumor of orbit An idiopathic proliferation of the lymphoid tissue surrounding the ocular orbit, which may be autoimmune in nature and related to orbital myositis Clinical Pain, exophthalmos, limitation of eye movement, lid erythema, edema, myositis, perineuritis, scleritis, dacryoadenitis; the lesion may be histologically impossible to differentiate from a true lymphoma, and may require molecular studies to determine clonality DiffDx Dacryoadenitis, orbital myositis, vasculitis, sclerosing pseudotumors, lipogranuloma, epithelioid cell granuloma, xanthogranuloma. See Pseudolymphoma.
References in periodicals archive ?
Segmental atrophy of the liver: A distinctive pseudotumor of the liver with variable histologic appearances.
Acetazolamide for pseudotumor cerebri--evidence from the NORDIC trial.
Idiopathic orbital myositis, also called myositis subtype of idiopathic orbital inflammatory pseudotumor, first described by Gleason (10) in 1903, is a myositis resulting in the inflammation of the extraocular muscles without any local or systemic reason.
The incidence of pseudotumor cerebri: population studies in Iowa and Louisiana.
The average maximum thickness of pseudotumors around the arterial and/or aortic walls was 12 mm (4-18 mm).
Extrapulmonary inflammatory myofibroblastic tumor (inflammatory pseudotumor): a clinicopathologic and immunohistochemical study of 84 cases.
The patient was diagnosed as having pseudotumor cerebri and herpes encephalitis and acetazolamide and acyclovir was initiated.
Plasma cell granuloma (inflammatory pseudotumor) of the breast.
She was diagnosed with pseudotumor cerebri, in which pressure rises around the brain.
An MRI orbit showed an ill-definedT1/T2 isointense-to-hypointense lesion (pseudotumor) replacing the orbital fat that diffusely involved intra- and extraconal compartments (Figure 1b, arrows).The extraocular muscles were encased by the lesion and appeared bulky, with mild flattening of the posterior globe (Figure 1c, arrows).