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Case Reports
. 2020 Dec 12;20(1):121-124.
doi: 10.4103/wjnm.WJNM_55_20. eCollection 2021 Jan-Mar.

Fibromatosis with aggressive demeanor: Benign impersonator of malignancy

J Naveen Kumar  1 , M Indirani  1 , Nikita Sampathirao  1 , S Shelley  1
Affiliations
Case Reports

Fibromatosis with aggressive demeanor: Benign impersonator of malignancy

J Naveen Kumar et al. World J Nucl Med. .

Abstract

Fibromatosis or desmoid fibromatosis is a rare benign neoplasm and develops commonly in the abdominal wall, abdominal cavity, or extra-abdominal sites. The mainstay of treatment is surgery. Chemotherapy and radiotherapy are preferred in cases of inoperable/relapse or a multifocal disease. Hereby, we report a case of fibromatosis arising in the left popliteal fossa, proven by histopathology and immunohistochemistry. Local excision of the mass was performed. The patient was asymptomatic for 6 months, after which she complained of difficulty in walking. Clinical evaluation elicited recurrence in the surgical bed. In spite of the surgical excision with tumor-free margins, recurrence was seen within a span of 6 months. 18F-fluorodeoxyglucose (FDG) positron emission tomography-computed tomography (PET/CT) was done to rule out multifocal disease and to define the extent of relapse. Although magnetic resonance imaging provides an excellent soft-tissue resolution to delineate the disease, 18F-FDG PET/CT is an important and supplementary tool which aids in the management of fibromatosis.

Keywords: Desmoid tumor; fibromatosis; fluorodeoxyglucose positron emission tomography-computed tomography in fibromatosis; recurrent fibromatosis.

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Conflict of interest statement

There are no conflicts of interest.

Figures

Figure 1
Figure 1
Magnetic resonance imaging of the left knee (presurgery) showing a large, lobulated, soft-tissue mass in the posterior aspect of the knee joint extending into the calf. The mass is inseparable from the medial head of gastrocnemius and popliteus muscle and is heterogeneously hyperintense on T2-weighted images. Popliteal vessels are displaced and are encased
Figure 2
Figure 2
Magnetic resonance imaging of the left knee (postsurgery) showing a recurrent mass with heterogeneously hyperintense on T2-weighted images in the posterior aspect of the knee joint encasing popliteal vessels
Figure 3
Figure 3
Maximum intensity projection in the anterior and posterior views showing physiological tracer uptake in the brown fat, thymus, breasts, heart, liver, spleen, kidneys, and bladder. Increased abnormal tracer uptake is seen posterior to the left knee joint
Figure 4
Figure 4
Coronal positron emission tomography-computed tomographyfused images showing mildly fluorodeoxyglucose-avid soft-tissue mass (white arrow) in the left popliteal fossa involving popliteus and gastrocnemius muscles
See this image and copyright information in PMC

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