Intermediate
Technical
IVT
mushroom-shaped tumor
Characteristic growth pattern of choroidal melanoma that has broken through Bruch's membrane into the retinal space.
Full Definition
A descriptive term for the characteristic appearance of choroidal melanomas that have grown through a defect in Bruch's membrane, creating a bilobed configuration resembling a mushroom. The 'stem' represents the choroidal component while the 'cap' is the portion that has prolapsed into the subretinal space. This growth pattern is typically associated with larger tumors and may indicate more aggressive behavior. The mushroom configuration is an important diagnostic and prognostic feature in uveal melanoma assessment.
Usage
Usage note: Describe both choroidal and subretinal components when documenting this finding.
In Context
- "Ultrasonography revealed a classic mushroom-shaped tumor with breakthrough of Bruch's membrane." — imaging interpretation
- "The mushroom-shaped tumor morphology suggested a more advanced stage requiring immediate treatment." — staging assessment
Also known as
collar-button tumor
mushroom configuration
Don't confuse with
dome-shaped tumor
diffuse choroidal thickening