Fig. 10. Mixed sarcoids have no predominate type and more than one distinct morphological form that can be recognized as falling into one of the more defined types. These pictures illustrate some examples that could be classified as mixed sarcoid. A, A mixed axillary sarcoid with verrucose and fibroblastic aspects in roughly equal measure. B, A mixed sarcoid with nodular, verrucose, occult, and early fibroblastic parts. C, A mixed nesting nodular and verrucose complex giving it no predominate type and classifying it as mixed.
Fig. 11. The malignant form of sarcoid is a locally invasive, aggressive, and infiltrative tumor. It is most common on the side of the face, the elbow, and the groin regions (including the pre-femoral flank fold). It does not metastasize so the term malignant has been avoided. A 14-year-old Welsh cob stallion developed malignant sarcoid in all the characteristic places including the medial thigh (A), the elbow (B), the face (C), and the ear (D).
