"focal mass" is correct and usable in written English.
It is typically used in a medical or scientific context to refer to a localized area of abnormal tissue or growth. Example: The doctor noticed a small focal mass on the patient's lung during the routine check-up. Further tests were conducted to determine if it was cancerous.
MRI shows a focal mass that is isointense to slightly hyperintense to muscle on T1-WI.
a Axial image demonstrates a small focal mass within the left atrium (arrowhead).
Presentations of brain abscesses are relatively nonspecific and occur due to focal mass expansion, intracranial hypertension, or diffuse destruction.
Patterns of metastatic deposits include a single focal mass (most common), diffuse gland enlargement and multiple pancreatic nodules (Fig. 12).
Lymphoma may be seen as an infiltrative soft tissue mass, polypoid large focal mass or multiple small nodules.
Pancreatic adenocarcinoma usually appears as a focal mass, most often in the head of the pancreas, leading to encasement and obstruction of the pancreatic duct and/or CBD.
In its focal form, AIP may present with a well-defined focal mass-like lesion (Fig. 2b, c), causing irregular narrowing of the pancreatic duct, common bile duct (CBD) involvement and pancreatic tail retraction, in a manner that may mimic focal pancreatic cancer.
Features of early phase inflammation, such as diffuse swelling and a peripancreatic capsule, are predictors of good response to corticosteroid therapy, whereas features of the later fibrotic phase of disease, such as focal mass-like swelling and ductal strictures, are predictors of a poorer response to treatment [35].
In the liver, both diffuse microscopic infiltration or focal mass-like lesions have been reported with EMH [ 2, 9, 10].
Unlike malignant tumors of the pancreas, focal mass-forming pancreatitis had similar enhancement to that of the normal surrounding parenchyma.
A cluster of heterotopic gray matter within the white matter or focal Taylor type cortical dysplasia may present as a focal mass-like lesion.
