Les hémangiomes palpébraux du nourisson : apport de l’IRM

Distribution and Clinical Characteristics of Periorbital Infantile Hemangiomas

Background: Periorbital infantile hemangiomas (POIHs) are associated with a high incidence of visual complications. Objective(s): To analyze the sites of predilection of POIHs and to determine whether certain sites require earlier intervention due to their higher rate of visual complications. Methods: A retrospective case series study was conducted on patients from two tertiary care centers for 25 years. The location of POIHs was determined from clinical photographs, medical records, and radiological studies. The presence or absence of anisometropic astigmatism (anisoastigmatism) and amblyopia was recorded. Data were analyzed using a chi-square test. Results: There were 486 patients, of which 302 patients had ophthalmology evaluations and 245 patients had refractive error data. At presentation, 10% of patients already had amblyopia and 44% had anisoastigmatism. Medial eyelid lesions had the highest risk of developing anisoastigmatism (anisoastigmatism correlates with eyelid position, p = 0.0001). Segmental and upper medial lesions had the highest risk of amblyopia at initial evaluation. Conclusion: The site of POIH is an important indicator for developing clinically significant anisoastigmatism and amblyopia, underlining the need for early ophthalmologic assessment and management.

Tumor pathology of the orbit

The term orbital tumor covers a wide range of benign and malignant diseases affecting specific component of the orbit or developing in contact with them. They are found incidentally or may be investigated as part of the assessment of a systemic disorder or because of orbital signs (exophthalmos, pain, etc.). Computed tomography, MRI and Color Doppler Ultrasound (CDU), play a varying role depending on the clinical presentation and the disease being investigated. This article reflects long experience in a reference center but does not claim to be exhaustive. We have chosen to consider these tumors from the perspective of their usual presentation, emphasizing the most common causes and suggestive radiological and clinical presentations (progressive or sudden-onset exophthalmos, children or adults, lacrimal gland lesions, periorbital lesions and enophthalmos). We will describe in particular muscle involvement (thyrotoxicosis and tumors), vascular lesions (cavernous sinus hemangioma, orbital varix, cystic lymphangioma), childhood lesions and orbital hematomas. We offer straightforward useful protocols for simple investigation and differential diagnosis. Readers who wish to go further to extend their knowledge in this fascinating area can refer to the references in the bibliography.

[Infantile hemangioma]

Infantile hemangioma is the most common tumor in children, but its pathophysiology is still not well understood. Infantile hemangioma develops during the first weeks of life, usually builds up over 3 to 6 months, and then regresses very slowly over a period of 3 to 7 years. Three quarters of these hemangiomas are lobular and are not associated with malformations. On the other hand, the hemangiomas referred to as segmental may be associated with developmental abnormalities (PHACES and PELVIS/SACRAL syndromes). Because of their spontaneous involution, most infantile hemangiomas do not require therapeutic intervention. In 10 to 15 % of cases, treatment is necessary because of complications when life or physiological functioning is threatened, or there are local complications or the long-term esthetic risk is too high. Until now, the standard first-line treatment has been general corticosteroid therapy. The usual choice for second-line treatment is interferon or vincristine. The efficacy of propranolol, a non-cardioselective beta-blocker, was recently reported.

[Infantile hemangiomas: differential diagnosis and associated anomalies]

Infantile hemangiomas are frequent benign vascular tumors that are often easily recognized. However, the diagnosis between infantile hemangiomas and other vascular tumors, whether benign or malignant, may be difficult. This chapter describes the different clinical presentations of hemangiomas and details the investigations that are needed to confirm the nature of the lesion and to diagnose the potentially associated anomalies. Knowledge on differential diagnosis enables clinicians to detect hemangiomas that can lead to complications and that necessitate a multidisciplinary approach.

Les lésions vasculaires de l’orbite

Vascular diseases are an important part of orbital pathology. We describe vascular tumours of the orbit and vascular diseases with repercussion on the orbit, from intra or extra orbital origin. The classification of these abnormalities is difficult and several terms are used to describe the same histological entity. The objective of this work is, using the current classification, to illustrate the different imaging aspects of the most frequent vascular diseases of the orbit.

Basic science and clinical aspects of vascular anomalies

PURPOSE OF REVIEW

Patients with vascular and lymphatic anomalies are often 'medical orphans' ascertained through distinct medical specialists. Multidisciplinary vascular anomalies programs provide focused expertise in diagnosis and treatment for patients. National and international workshops on vascular anomalies are fostering clinical and basic science research to enhance our understanding of vascular development and vascular anomalies. Herewith is presented an update of recent advances in the study of vascular/lymphatic anomalies.

RECENT FINDINGS

New original findings include (1) the identification of distinct cell surface markers and other cellular properties in hemangiomas and vascular malformations relevant to vascular development, (2) the discovery of novel genetic mutations and susceptibility genes in patients with vascular anomalies, (3) recognition of new risk stratifications and clinical issues for patients with hemangiomas and vascular malformations, and (4) the elucidation of sequelae from the disorders as well as side effects of recent and previous therapies for vascular anomalies.

SUMMARY

Vascular anomalies are an attractive model for the study of human disorders of vasculogenesis and angiogenesis. The etiology of these disorders is unclear and likely represents a multifactorial process. Clinical clues are leading to scientific investigations that may enable targeted therapies, prevention strategies, or both.