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Nodular fasciitis : Microscopic

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Based on the relationship of the main mass to the fascia, nodular fasciitis can be subdivided into subcutaneous, intramuscular, and fascial types. Rare cases arise in the dermis.

Subcutaneous type (the most common type and shown here) is a well-circumscribed nodule attached to the fascia and it grows upwards into the subcutis. The intramuscular subtype is attached to the fascia, but the bulk of the lesion is within the muscle. Intramuscular lesions can attain large sizes. The fascial subtype is poorly-circumscribed with an irregular, stellate growth pattern along the fascial septa.

Image courtesy of: Rola Ali, MD, FRCPC, Associate Professor of Pathology, Kuwait University, Kuwait; used with permission.

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