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Case ReportCase Report

Dural Infantile Hemangioma Masquerading as a Skull Vault Lesion

C. Philpott, A. Wray, D. MacGregor and L. Coleman
American Journal of Neuroradiology June 2012, 33 (6) E85-E87; DOI: https://doi.org/10.3174/ajnr.A2752
C. Philpott
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A. Wray
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D. MacGregor
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L. Coleman
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Abstract

SUMMARY: We describe a case of intracranial dural IH initially diagnosed as a primary skull vault lesion hemangioma due to associated focal hyperostosis. Histopathologic examination of the dural component confirmed IH. The case is discussed in the context of IH within the neural axis.

ABBREVIATIONS:

Glut-1
glucose transporter-1 by immunohistochemistry
IH
infantile hemangioma

IHs are the most common benign neoplasms of infancy. Although intracranial lesions are relatively rare, they occur predominantly in the basal cisterns. IH presenting in a dural location has never previously been described, to our knowledge.

Case Report

A 12-month-old girl, a monozygotic twin, presented with an enlarged but stable head circumference greater than the 95th percentile with no neurologic signs. Sonography revealed mild ventriculomegaly and enlargement of the extra-axial spaces, compatible with benign enlargement of these spaces. MR imaging was performed, revealing an unexpected finding of focal expansion of the cancellous diploe of the right parietal bone with diffuse thickening and enhancement of the underlying dura (Figs 1 and 2).The dural abnormality was adjacent to the bony lesion but extended well beyond the lesion, including the dura of the tentorium. Apart from mild distortion of the adjacent posterior parietal lobe, there was no abnormality of the underlying brain.

Fig 1.
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Fig 1.

Axial T2 (A) and T1-weighted (B) sequences demonstrating iso- to mildly high T2 signal intensity, the iso-T1 signal intensity dural thickening, and adjacent focal diploic bone expansion with hyperostosis.

Fig 2.
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Fig 2.

Axial (A) and coronal (B) T1 post-gadolinium-enhanced sequences demonstrating the avidly enhancing abnormal dural thickening underlying the hyperostosis.

A CT scan confirmed the focal expansion of the diploic bone and endosteal thickening (Fig 3). A benign bone lesion with an abnormal dural reaction, specifically a hemangioma, was favored, but the lack of diploic enhancement was thought atypical for such a lesion. The appearance of the dura raised suspicions of a more sinister process necessitating histopathologic analysis; hence, excisional biopsy, along with resection of abnormal bone, was performed. On histopathologic examination, the bone segment demonstrated symmetric expansion of cancellous bone covered by an unremarkable cortex with normocellular intervening marrow consistent with reactive bone. The dural biopsy demonstrated numerous irregular small blood vessels permeating the mature fibrous tissue (Fig 4A), the endothelium of which stained strongly for Glut-1 by immunohistochemistry (Fig 4B).

Fig 3.
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Fig 3.

CT scan demonstrating benign-appearing focal diploic expansion and hyperostosis.

Fig 4.
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Fig 4.

A, Mature fibrous tissue permeated by blood vascular channels of various sizes (hematoxylin-eosin, original magnification ×20 objective). B, Strong, uniform staining of endothelial cells for Glut-1 (immunohistochemical stain, original magnification ×40 objective).

MR imaging at 6-month follow-up revealed reduction in dural thickening consistent with spontaneous involution and appropriate bony healing. Clinically, without further treatment, the patient is achieving milestones with plateauing of her head growth. Dedicated review revealed no cutaneous lesions.

Discussion

IHs (previously termed “capillary hemangiomas”) are the most common vascular tumors of infancy. They are benign neoplasms of endothelial cells that rapidly proliferate initially, usually in the first 5 months of life, followed by a plateau phase and slow involution.1 On histologic examination, these lesions comprise lobules of tightly packed endothelial cells forming capillary-like structures, separated by septa of fibrous connective tissue.1,2 Identification of the Glut-1 protein on immunohistochemical staining is used to distinguish these lesions from other vascular lesions.1 More commonly, they involve the skin and soft tissues. Involvement of the neural axis is rare.

There have been 28 cases of intracranial IH published in the literature.3⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓⇓–16 Classically, these cases involve the extra-axial basal cisterns, subarachnoid and ventricular spaces, and cavernous sinus.7⇓⇓–10,12⇓–14 Two articles reported dural attachment,10,16 and only 4 cases were intra-axial.3,4 Most intracranial IHs (71%)4,7,9,12,14 were associated with extracranial soft-tissue extension or cutaneous hemangiomas.

While spinal dural capillary hemangiomas have been described, this is the first case of cranial dural IH. Cranial IH typically presents in childhood (86%),3⇓⇓⇓⇓⇓–9,12,14⇓–16 and in a few cases, in adolescence,3,10,11,13 while spinal IH usually presents in an older population, (range, 40–62 years).17

The imaging characteristics of IH within the neural axis are consistent with those found elsewhere, with iso- to low-T1 signal intensity, high T2 signal intensity, and avid contrast enhancement typical on MR imaging.14,17 Intralesional flow voids are a common feature,10,14 and foci of high T1 signal intensity are also described.4,10,17 This may represent thrombosis in some of the small vascular spaces or hemorrhage.

Our initial interpretation of the imaging findings was that this was primarily a bony lesion, an intradiploic IH, with hyperostosis and secondary dural reaction. However, the features were atypical and of concern. There was hyperostosis but no abnormal diploic space enhancement or large abnormal diploic space vessels. The dural reaction was too extensive and florid to be a secondary dural reaction to an intradiploic IH or an essentially benign-appearing bone lesion. Meningioma was considered a possibility, given the florid hyperostosis and dural thickening; however, the appearance was also atypical for this condition. The extensive dural thickening on imaging, therefore, raised concern of a primary dural lesion of sinister etiology.

Hydrocephalus was been described in 10% of intracranial IHs. It is uncertain whether this represents an association with or a consequence of the hemangioma. It could be postulated that thrombosis of small venous structures associated with the hemangioma or the direct mass effect of the lesion alters local CSF flow dynamics, resulting in hydrocephalus. The mild ventricular dilation in our case may reflect such a prior CSF flow alteration because we postulated that this lesion was already involuting at diagnosis.

Given that IHs are self-limited, management is dependent on size, location, and any associated complications, which include visual and neurologic deficits for the intracranial lesions. Contemporary management of IH is with propranolol; however, systemic steroid and interferon therapy has been described.12,13 In the absence of complicating features, observation in expectation of involution is favored.

Conclusions

We report a new entity of intracranial dural hemangioma, histologically confirmed by Glut-1 staining. The description of the imaging findings and pitfalls in diagnosing this lesion should be considered in assessing durally based lesions in childhood and should help to guide the management of this benign self-limiting lesion.

Footnotes

  • Disclosures: Alison Wray—Unrelated: Travel/Accommodations/Meeting Expenses: Medtronic,* Details: educational grant to attend intrathecal baclofen users' group meeting. * Money paid to institution.

References

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  • Received April 23, 2011.
  • Accepted after revision May 17, 2011.
  • © 2012 by American Journal of Neuroradiology
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American Journal of Neuroradiology: 33 (6)
American Journal of Neuroradiology
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Dural Infantile Hemangioma Masquerading as a Skull Vault Lesion
C. Philpott, A. Wray, D. MacGregor, L. Coleman
American Journal of Neuroradiology Jun 2012, 33 (6) E85-E87; DOI: 10.3174/ajnr.A2752

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Dural Infantile Hemangioma Masquerading as a Skull Vault Lesion
C. Philpott, A. Wray, D. MacGregor, L. Coleman
American Journal of Neuroradiology Jun 2012, 33 (6) E85-E87; DOI: 10.3174/ajnr.A2752
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