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Marginal Tumor Cysts As a Diagnostic MR Finding

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Marginal Tumor Cysts As a Diagnostic MR Finding Sinonasal Esthesioneuroblastoma with Intracranial Extension: Marginal Tumor Cysts as a Diagnostic MR Finding Peter M. Som, Mika Lidov, Margaret Brandwein, Peter Catalano, and Hugh F. Biller PURPOSE: To determine whether the MR finding of cysts along the intracranial margin of sinonasal esthesioneuroblastomas can be considered to suggest this tumor. METHODS: MR scans of 54 patients who had sinonasal lesions with intracranial extension were examined specifically for cysts along the intracranial margins of the lesions. RESULTS: Only 3 of the 54 patients had these cysts, and all 3 of these patients had esthesioneuroblastoma. Surgical pathologic findings of one speci­ men showed the cyst to be marginally located within the tumor. CONCLUSION: If cysts are seen on MR along the intracranial margin of a sinonasal mass, this finding highly suggests esthesia­ neuroblastoma. Index terms: Esthesioneuroblastoma; Nose, magnetic resonance AJNR Am J Neuroradio/15:1259-1262, Aug 1994 Radiologists often seem on a constant quest amelanotic melanomas, and embryonal rhab­ to give histologic diagnosis for disease seen on domyosarcomas ( 2). All of these neoplasms are sectional imaging studies. Rarely can this be undifferentiated, small-cell tumors, and like es­ accomplished. However, sometimes the pres­ thesioneuroblastoma can occur in the nasal ence of one or more imaging findings can allow fossa, with spread to the paranasal sinuses and the radiologist to offer a histologic diagnosis that anterior cranial fossa. Electron microscopy and has a very high degree of reliability. With this histochemical testing are required to establish a aim in mind, we examined the imaging studies definitive diagnosis (3). of 54 patients who had sinonasal masses with Initially, there was hope that radiologists extension into the anterior cranial fossa. Specif­ could differentiate these lesions on sectional im­ ically, we were interested in a group of patients aging. Unfortunately, both the computed tomo­ who had esthesioneuroblastoma, or olfactory graphic and magnetic resonance (MR) findings neuroblastoma, an uncommon tumor that arises of the malignant tumors are usually nonspecific primarily in the nasal fossa. Extension of this and rarely can be used to establish a definitive tumor into the paranasal sinuses occurs in about diagnosis (4, 5). The only finding that has been 40% of patients, and gross intracranial spread reported as suggesting esthesioneuroblastoma occurs in about 30% of cases ( 1). In adults, is the presence of calcifications within the lesion some of these tumors are histologically con­ (6). However, because such calcification fre­ fused with anaplastic carcinomas, large-cell quently cannot be distinguished from residual lymphomas, extramedullary plasmacytomas, bone, which may be present in all of these le- sions, it is difficult to refer to such calcification as being characteristic of this lesion (7). Received August 18, 1993; accepted pending revision October 6; revi- In addition, all of the noncarcinomatous tu­ sian received October 14. mors in this group tend to remodel adjacent From the Departments of Radiology (P.M.S., M.L.), Otolaryngology bone around them, whereas anaplastic carci­ iP. M.S., P.C. , H.F.B), and Pathology (M.B.), Mount Sinai School of Medi· noma usually causes rapid bone destruction ~ i ne , City University of New York. Address reprint requests to Peter M. Sam, MD, D':! partment of Radiol­ (3). However, there is still sufficient overlap in ogy, Mount Sinai Hospital, Box 1234, One Gustave Levy PI, New York, NY the type of bone reaction that it cannot reliably 10029. be used to establish a specific diagnosis. ;\ JNR 15:1259-1262, Aug 1994 0195-6108/94/1507-1259 We have seen three cases of esthesioneuro­ 9 American Society of Neuroradiology blastoma that had intracranial extension with 1259 1260 SOM AJNR: 15, August 1994 tumoral cysts at the margins of the intracranial disease. These cases are reported and reviewed with regard to these cysts' representing an im­ aging finding that may be highly suggestive of esthesioneuroblastoma. Materials and Methods Our files were searched for MR examinations of patients with sinonasal lesions that had intracranial extension. A total of 54 cases were found representing 25 malignancies (6 different tumors), 16 cases of polyps or fungal disease, 8 cases of benign fibroosseous lesions, 3 cases of anterior fossa meningiomas that extended into the sinonasal cav­ ities, and 2 cases of angiofibroma. A breakdown of these 54 cases follows. Malignant tumors (n = 25) A Squamous cell carcinoma 1 Esthesioneuroblastoma 5 Marginal cysts 3 Adenocarcinoma 2 Melanoma Large-cell lymphoma Hemangiopericytoma 1 Polyps and mucoceles 16 Benign fibroosseous lesions (n = 8) Fibrous dysplasia 4 Ossifying fibroma 3 Cementifying fibroma 1 Meningioma 3 Angiofibroma 2 Because we work at a referral center, many of our patients come for consultation already having been evaluated with sectional imaging studies. As such, there were a number of different MR scanners used, with a variety of scan proto­ cols. The images shown represent this case material (Figs 1- 3). All cases had either biopsy or postoperative patho­ B logic confirmation. Fig 1. A, Sagittal T1 -weighted (600/15 [repetition time/echo time]) postcontrast MR scan shows a large enhancing paranasal Results sinus and nasal cavity mass that has extended into the anterior cranial fossa . The tumor has eroded the floor of the frontal si ­ The only patients who had cystic lesions at nuses, entrapping secretions within them. Similarly, the anterior the margins of the intracranial tumor compo­ wall of the sphenoid sinuses has been destroyed by the lesion, nents were three of the five with esthesioneuro­ trapping secretions within these sinuses. There is a 6-cm low­ blastoma. No other lesions were identified that signal -intensity cystic region on the dorsal surface of the intracra­ had such cysts. The broadest base of the cysts nial portion of the tumor, which invades the brain and left lateral ventricle. The margin of the cyst adjacent to the tumor is convex was along the tumor margin. With all of the inward to the cyst, and there is a thin enhancing cyst rim. tumors in this study, there was a nonspecific B, Axial Tl-weighted (760/ 20) postcontrast MR scan shows generalized variable enhancement on MR. Ele­ the intracranial portion of the tumor, the dorsally positioned cyst ments of bone destruction were present in all with its thin enhancing rim, and the obstructed frontal sinuses. The cases, although there was also some bone re­ cyst contents are nonhomogeneous and of a higher signal inten­ modeling in the noncarcinomatous cases. Be­ sity than the cerebrospinal fluid. cause only MR studies were evaluated, no com­ ment was made regarding the presence of small tomosing islands of "small blue round cells," calcifications within the masses. and numerous rosettes and pseudorosettes Pathologic examination in one case (Fig 1) were present. Cytologically, the nuclei were showed that the tumor was composed of anas- grade II, with prominent nucleoli, mild pleomor- AJNR: 15, August 1994 ESTHESIONEUROBLASTOMA 1261 Fig 2. A , Coronal Tl-weighted (500/ 13) postcontrast MR scan shows a recurrent nonhomogeneously enhancing right nasal cavity and ethmoid sinus mass that extends into the right anterior cranial fossa and ob­ structs the right maxillary sinus. Along the intracranial margin of the lesion, there is a low-signal-intensity cyst that has a thin en ­ hancing rim. The border of the cyst adjacent to the tumor is convex inward to the cyst. 8, Axial T2-weighted (3000/1 02) MR scan shows the high-signal-intensity cyst with a fluid-fluid/debris level. A phism, and occasional mitoses. Occasional tents of the cysts were closer to cerebrospinal laminated calcifications were also seen. Histo­ fluid in appearance, and the intracranial mass logically, the cyst contents consisted of hemor­ was also intraaxial. rhage, degenerated mucoid material, and tu­ mor. The cyst wall was not a true cyst lining, but Discussion rather was composed of compressed malignant cells and fibrous tissue. The diagnosis was es­ There is a constant desire on the part of both thesioneuroblastoma with a marginal tumor radiologists and clinicians to establish a histo­ cyst. logic diagnosis based on the sectional imaging Because a similar appearance of the cyst findings. This is especially true with regard to contents was seen on the MR in one other case malignancies. Strangely, this desire to make (Fig 2), the cyst's contents were most probably such an "early" diagnosis persists despite gen­ similar to those of case 1, and thus were also eral concession that only the pathologist can necrotic tumor. In both of these cases, the tu­ make the final diagnosis. Unfortunately, each mor had invaded the brain, becoming intraaxial. such imaging effort has been met with some In the remaining case on MR (Fig 3), the con- degree of frustration, because no one finding is Fig 3. A, Sagittal T1 -weighted (350/27) postcontrast MR scan shows a recurrent tumor in the paranasal sinuses, nasal cavity, and anterior cranial fossa. The patient had a prior craniofacial resection. Along the cranial tumor margin, several small low-signal-intensity cysts are present. They have a slightly higher signal intensity than the cerebrospinal fluid. 8, Axial Tl-weighted (550/ 27) postcontrast MR scan shows a low-signal-intensity cyst along the intracranial tumor margin. The border of the cyst adjacent to the tumor is convex inward to the cyst; the cyst has a thin enhancing rim, and its contents have a signal intensity close to that of the cerebrospinal fluid. 1262 SOM AJNR: 15, August 1994 unique to a specific tumor (4, 5). Although in Although the 54 cases examined in this series this regard the degree of enhancement and the are statistically a small sample, the marginal type of adjacent bone involvement have been cysts were identified only in the 3 patients with helpful findings, they still are sufficiently non­ esthesioneuroblastoma.
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