Intracranial melanocytic meningeal tumours and melanosis oculi: case report and literature review
© Doglietto et al.; licensee BioMed Central Ltd. 2012
Received: 27 December 2011
Accepted: 6 June 2012
Published: 6 June 2012
Melanocytic meningeal tumours are rare extra-axial neoplasms of the nervous system, with only three reported cases in the cavernous sinus. Herein we describe for the first time the association of ocular melanosis and multiple intracranial melanocytic meningeal tumours, with the presenting lesion being in the cavernous sinus. The importance of this association is discussed together with the diagnostic and therapeutic challenges of the case.
A 20-year-old man presented with a left sixth cranial nerve deficit; general examination documented only congenital melanosis of the homolateral eye. MRI examination showed a space occupying lesion in the left cavernous sinus, which was followed conservatively for 2 years, until a new space occupying lesion was evident at the level of the right frontal convexity: both lesions presented with neuroradiological characteristics suggestive of melanin content.
The frontal convexity lesion was removed: intraoperatively the dura was markedly and diffusely melanotic. Histological examination documented a melanocytic meningeal tumour, with a proliferative index of 3 %. The patient underwent 3D-Conformal Radiation Therapy on the lesion of the cavernous sinus (total dose 5040 cGy), with initial tumour reduction. Three years later, due to a symptomatic growth, he underwent partial removal of the lesion in the cavernous sinus. Histological examination was unchanged. He then received adjuvant Temozolomide with Low Dose Fractionated Radiation Therapy (LD-FRT). Due to further disease progression cisplatin plus fotemustine were administered, concomitant with LD-FRT: after two cycles MRI documented significant disease regression. After a period of apparent disease control, the patient presented with persistent cough and evidence of multiple thoracic metastases, which lead to his death, seven years after presentation.
Intracranial melanocytic meningeal tumours are challenging lesions, both from a diagnostic and therapeutic point of view; though rare, the possible association with ocular melanosis should be recognized and might facilitate an early diagnosis. Surgery remains the best possible option when feasible. In the event of partial resection, this “benign” disease might be clinically aggressive.
KeywordsMelanocytoma Melanocytic meningeal tumour Intracranial melanocytosis Melanosis oculi Cavernous sinus
Melanocytic meningeal tumour is a rare tumour of the nervous system with approximately 110 reported cases [1–3]. The possible association with nevus of Ota (also known as oculo-dermal melanocytosis, which is characterized by the association of ocular and skin or mucosal melanocytosis) [2, 4–9] has been reported previously.
Herein we describe the unique case of the association of simple ocular melanosis and multiple intracranial melanocytic meningeal tumours. The diagnostic and therapeutic challenges of the case are presented together with a concise literature review.
Clinical and neuroradiological presentation
Five days after surgery the patient developed a marked diplopia, pain in the eye and a third cranial nerve palsy. An urgent CT scan documented a minimal enlargement of the cavernous sinus lesion (not shown). Corticosteroid treatment was initiated and three weeks later there was complete resolution of both pain and cranial nerve palsy. Corticosteroids were subsequently tapered and discontinued. The patient underwent 3D-Conformal Radiation Therapy (3D-CRT) of the lesion of the cavernous sinus (total dose 5040 cGy with a daily dose of 180 cGy), with an initial tumour reduction. Three years later, due to a symptomatic growth, the patient underwent surgical debulking of the lesion with resolution of the pre-operative trigeminal neuralgia and persistence of third cranial nerve palsy. Histological examination of the lesion documented features similar to the previously resected lesion, with a proliferative index of 2 %.
He then received four cycles of adjuvant Temozolomide (150–200 mg/mq/die for 5 days q 28); the third and fourth cycle were combined with Low Dose Fractionated Radiation Therapy (LD-FRT) 0.4 Gy twice daily [11, 12], with at least a 6-hour inter-fraction interval, over 5 consecutive days, every 28 days. Subsequent MRI examinations documented progressive disease: we then prescribed cisplatin (30 mg/m2 on days 1, 8, and 15) and fotemustine (40 mg/m2 on days 2, 9, and 16) , concomitant with LD-FRT 0.3 Gy twice daily, with at least a 6-hour inter-fraction interval  on days 1–2, 8–9, and 15–16, every 42, with at least a 6-hour inter-fraction interval, over 5 consecutive days, every 28 days. After two cycles MRI documented significant tumour reduction and there was a period of apparent tumour control. Unfortunately, the patient later presented with persistent cough and hypoxia: a total body CT scan documented multiple thoracic space occupying lesions, compatible with metastases. The patient died due to systemic tumour progression seven years after initial presentation.
Meningeal melanocytic tumour is a rare tumour of the nervous system, with approximately 110 cases reported since 1972 [1, 5]. It originates from melanocytic cells located in the leptomeninges and is usually a solitary lesion, mostly located in the posterior fossa and along the cervico-thoracic spinal cord . To the best of our knowledge, only three case of melanocytoma of the cavernous sinus have been described [8, 15, 16]. According to Brat , primary melanocytic neoplasms consist of a spectrum of tumours ranging from melanocytomas to malignant melanomas. Melanocytic tumours with intermediate features (intermediate grade melanocytic neoplasms) share almost all the histological features of melanocytomas and most of the features of malignant melanomas. Below we identify some factors that render these tumors difficult to diagnose and their biological behaviour challenging to predict.
On computerized tomography (CT) imaging, melanocytic tumors appear as iso- to slightly hyper-dense lesions with homogeneous enhancement after contrast media administration [17, 18]. This CT appearance is though non-specific and similar to that of meningiomas. On MRI melanocytic tumors are generally reported as iso- to hyper-intense on T1-weighted images and hypo-intense on T2-weighted images, with variable degree of homogeneous enhancement with paramagnetic contrast injection [17–21]. Unfortunately MRI appearance of melanocytic tumours may vary due to their heterogeneous content of melanin pigment as well as the presence of other features, such as intratumoral hemorrhages. Thus, the classically reported neuro-imaging features could not reliably distinguish melanocytic tumors from other most common tumors that may be found in similar dural locations, i.e., most notably meningioma, schwannoma and malignant melanoma.  However on the basis of our personal experience (4 pathologically proven, mostly intraspinal, melanocytic tumors – C. Colosimo, MD, unpublished data, April 2009) the rational analysis of the MR signal behaviour strongly suggests a melanocytic tumors when the lesion appears hyper-intense on un-enhanced T1-weighted images, at the same time showing less intensity on gradient-echo T2*-weighted than on turbo spin echo T2-weighed images.
Melanocytic tumors and melanosis
Intracranial melanocytic non-metastatic tumors can be associated with nevus of Ota or oculodermal melanosis ; to the best of our knowledge, the association of melanocytic tumors with simple melanosis oculi  has not been reported: only one case of intracranial melanoma associated with melanosis oculi has been previously described . The importance of this association cannot be overestimated for the clinical differential diagnosis. From an ethiopathogenetic point of view the presence of congenital melanosis oculi and the intraoperative finding of diffuse blackening of the dura are suggestive of an evolution of a congenital malformation to cancer. It has indeed been suggested that meningeal melanosis, a benign excess of melanotic cells in the leptomeninges, may be a predisposing lesion that could transform into melanocytic tumor or CNS melanoma [6, 8].
Complete surgical resection is the best treatment for meningeal melanocytic tumors . If not possible, partial tumor removal followed by local radiotherapy is suggested . Primary radiotherapy or radiosurgery may be useful for tumors, which are not amenable to complete surgical resection, as the cavernous sinus lesions in our case .
Radiotherapy improves outcomes and a total dose of 50.4 Gy (1.8 Gy per fraction) appears appropriate for most patients . Radiosurgery may be an alternative therapeutic option, but specific reports are still limited .
To the best of our knowledge there is also a lack of data concerning the role of chemotherapy in the treatment of melanocytic tumors . Our decision to prescribe chemotherapy was related to the disease progression after radiation therapy and incomplete resection. Temozolomide, an oral alkylating agent, and Fotemustine (FTM), a third-generation nitrosourea with an alkylating cytotoxic activity, were used because they are able to cross the blood–brain barrier; moreover their efficacy in treating newly diagnosed glioma or melanoma brain metastases has been largely demonstrated in combination with radiotherapy.
Rare cases have been reported with leptomeningeal spread [27–29] transformation to malignant melanoma  and even distant metastases [31–34]. This potentially aggressive behaviour led Cordoba and co-workers  to suggest that melanocytic tumors should be considered as a borderline malignant tumour. This is indeed confirmed by the clinical evolution of our patient, who had an apparently stable disease six years after initial symptoms and diagnosis, but only after chemotherapy and radiotherapy; unfortunately, his disease further progressed, with evidence of systemic metastases that lead to his death. This supports the use of the term "melanocytic neoplasm of indeterminate biologic potential" for tumours that demonstrate intermediate histological features and might have an aggressive clinical behavior .
This is the first reported case of the association of simple ocular melanosis and intracranial melanocytoma. Awareness of this association and of the radiological characteristics of the lesion might help the pre-operative diagnosis of this rare intracranial tumor. The clinical course of our patient indeed confirms the relatively aggressive behavior of this tumor.
Written informed consent was obtained from the patient for publication of this Case report and any accompanying images. A copy of the written consent is available for review by the Series Editor of this journal.
No funding was provided for this study.
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