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Haemophilic pseudotumors are reported in 1-2% of patients with hemophilia.
The clinical presentation varies considerably depending on location of pseudotumor, but is generally slowly progressive and chronic.
Most develop in the muscles of the pelvis and lower extremity, where the large muscles have an abundant blood supply, or in bone following intraosseous bleeding.
Ultrasonography, CT and MRI have significant roles in detecting pseudotumors, especially when they are in the pelvis.
X-ray is useful in diagnosing intraosseous pseudotumors. They appear as well-defined, unilocular or multiloculated, lytic, expansile lesions of variable size. It can involve metaphysis, diaphysis and epiphysis of long bones.
Other findings include endosteal scalloping, perilesional sclerosis, cortical thinning or thickening, trabeculations and septations. Pathological fractures can also be present.
In the acute and subacute stages, sonography shows a central anechoic area with increased echoes behind the lesion, caused by fluid in the pseudotumor. A distinct plane separates the mass from the surrounding muscles.
CT shows the thick wall more consistently than does ultrasonography. Multiple irregular echoes represent solid material that cannot be documented on CT. Differential diagnosis from abscess may be difficult.
CT is useful for detecting both the extent of soft-tissue masses and the involvement of bone. Pseudotumors contain coagulated blood and are surrounded by a thick wall.
Contrast-enhanced CT is useful for determining the thickness of the wall. In the acute stage, the center of the pseudotumor is hypodense on CT, but the periphery is isodense and indistinguishable from surrounding muscle.
The hypointense rim of a pseudotumor on both T1 and T2-weighted images consists of fibrous tissue that contains hemosiderin.
Treatment and prognosis
The ideal treatment is prevention with adequate management of acute bleeds (e.g. rest, factor replacement, physiotherapy, etc.) 6. If development of a pseudotumor occurs, multiple management options have been described, including low-dose radiotherapy, percutaneous curettage, surgical resection, or filling with bone graft or other compounds 5,6.
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- 6. Rodriguez-Merchan EC. Hemophilic Pseudotumors: Diagnosis and Management. (2020) The archives of bone and joint surgery. 8 (2): 121-130. doi:10.22038/abjs.2019.40547.2090 - Pubmed