Demonstrate through representative cases with histological verification, the imaging findings of infrequent orbital tumors.

The orbital masses comprise a broad spectrum of benign and malignant entities. The imaging findings of the frequent orbital masses are widely described in the literature. The less frequent pathologies of orbital masses represent a diagnostic challenge, so it is important to know clues that may suggest their diagnosis.

We present the following clinical cases that turned out to be infrequent -and unexpected- orbital tumors. Case Nº 1: 24-year-old man with right proptosis. Figure 1: The initial computed tomography (CT) scan shows a solid right intraconal mass, isodense to the muscles (A). It reaches the orbital apex without spreading to the sphenoidal cleft (B,C), and also contacts and displaces the optic nerve (D). After contrast administration, it shows intense heterogeneous enhancement (B,C,D). Figure 2: Contrast-enhanced CT scan, a year after the initial study. There...

Take Home Points: The solitary fibrous tumor is a non-aggressive lesion that is highly vascularized and the key to the differential diagnosis with more frequent lesions such as hemangioma or schwannoma is the “washout” enhancement pattern, which differentiates it from both and also the progressive growth of the solitary fibrous tumor, which differentiates it especially from hemangiomas. Nodular fasciitis is a lesion that could be considered in the differential diagnosis of a focal lesion of anterior compartment predominance, with moderate to intense enhancement, in a...

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