A Case of Pelvic Schwannoma Presenting Prominent Eggshell-Like Calcification

Nakashima, Taisuke; Tsurumaru, Daisuke; Nishimuta, Yusuke; Miyasaka, Mitsutoshi; Nishie, Akihiro; Honda, Hiroshi

doi:10.1155/2013/825078

Cited by 4 publications

(9 citation statements)

References 7 publications

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“…The majority of tumors with calcification in our cohort arose in association with the spinal nerve roots (10 cases), with the cervical and thoracic regions most commonly involved, or in the CPA (4 cases). These findings are concordant with what has been reported in the literature with nine out of 29 (31%) previously reported cases of schwannomas with calcification presenting as spinal cord masses, most often the thoracic spine, and nine (31%) arising in the CPA/vestibular nerves/internal auditory canal . Of the 10 cases with calcification in our cohort presenting in the spinal region, seven harbored dystrophic calcification, five had psammomatous calcification, and two contained both dystrophic and psammomatous calcifications.…”

Section: Discussionsupporting

confidence: 92%

“…The first case documenting calcification in schwannomas was published in 1961 by Lombardi and Passerini who described calcifications in spinal tumors radiologically detected . In the interim, only single case reports and rare small series have documented dystrophic and/or psammomatous calcification or ossification in schwannomas . Furthermore, the two series available describe two cases each and are limited to vestibular schwannomas .…”

Section: Discussionmentioning

confidence: 99%

“…These findings are concordant with what has been reported in the literature with nine out of 29 (31%) previously reported cases of schwannomas with calcification presenting as spinal cord masses, most often the thoracic spine, and nine (31%) arising in the CPA/vestibular nerves/internal auditory canal. [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][22][23][24][25][26][27][28][29][30][31] Of the 10 cases with calcification in our cohort presenting in the spinal region, seven harbored dystrophic calcification, five had psammomatous calcification, and two contained both dystrophic and psammomatous calcifications. The presence of dystrophic-type calcification in a neoplasm arising adjacent to the spine may lead to a differential diagnosis of other calcified neoplasms occurring in this region including teratomas.…”

Section: Discussionmentioning

confidence: 99%

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Calcification and ossification in conventional schwannoma: A clinicopathologic study of 32 cases

et al. 2019

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Calcification and ossification are uncommon in schwannomas; however, when present these findings may cause diagnostic confusion with other mesenchymal tumors which more frequently harbor these features. We sought to better characterize the type and rate of calcification and ossification in schwannomas. Cases of schwannoma diagnosed at our institution from 2005 to 2019 were reviewed to determine the type and amount of calcification and ossification present. Of 2116 total cases of schwannoma reported during the study period, 38 cases harbored calcification or ossification per the pathology report. Thirty‐two of the 38 cases had slides available for review, of which 27 (84.3%) showed calcification, nine showed ossification (28.1%), and four (12.5%) cases demonstrated both. Foci of ossification typically occurred adjacent to large vessels. Of the 27 cases showing calcification, coarse dystrophic calcification was seen in 22 cases, psammomatous calcification in nine cases, and combined dystrophic and psammomatous calcification was seen in four cases. Cases with psammomatous calcification predominantly occurred in spinal roots and cerebellopontine angle of a younger age group with almost equal gender distribution. All four cases tested for protein kinase cyclic adenosine monophosphate‐dependent type I regulatory subunit alpha immunohistochemical stain demonstrated retained expression. We confirm that calcification and ossification are rare findings in schwannoma. Awareness that these features may be present in these tumors will prevent misdiagnosis and ensure appropriate clinical management.

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Section: Discussionsupporting

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Calcification and ossification in conventional schwannoma: A clinicopathologic study of 32 cases

et al. 2019

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“…In contrast, they rarely occur in the pelvis with a reported incidence of 1–3% and typically associated with neurofibromatosis type 1 (von Recklinghousen disease), less than 0.5%. 2 , 3 Patients usually present in the 2nd and 5th decades without significant sex predilection. Schwannomas are nonaggressive, slow-growing, solitary masses with a low rate of malignant transformation and a low risk of recurrence after resection.…”

Section: Introductionmentioning

confidence: 99%

Pelvic schwannoma in an adult male

Dau

Tran

Nguyen

et al. 2022

Acta Radiologica Open

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Schwannomas are benign nerve sheath tumors that are generally encapsulated and commonly detected in the head, neck, and mediastinal regions. Schwannomas localizing in the pelvis are extremely rare and tend to be asymptomatic initially due to slow growth rate. Schwannomas may be misdiagnosed as urologic or gynecologic tumors. Pelvic schwannomas are typically solitary, large, and well-circumscribed masses in the retroperitoneum or presacral areas. Other imaging characteristics are cystic degeneration, repeated hemorrhages, and calcifications. Calcification patterns can be punctate, speckled, curvilinear, or along the walls of the masses. We report a young man with a pelvic schwannoma with typical imaging features.

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“…These tumors generally occur in the head, neck, and extremities, and occurrence in the pelvic space is rare [1, 2]. There are a few reports of laparoscopic surgery (LS) for pelvic schwannomas [3, 4].…”

Section: Introductionmentioning

confidence: 99%

Laparoscopic Extirpation of a Schwannoma in the Lateral Pelvic Space

Hidaka

Ishiyama

Maeda

et al. 2016

Case Reports in Surgery

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Schwannomas in the lateral pelvic space are very rare. Here, we report the case of a 48-year-old woman who had a tumor detected in her abdomen by abdominal ultrasonography. Abdominal computed tomography and magnetic resonance imaging revealed a well-defined solid tumor of 65 mm in diameter in the right lateral pelvic space. We performed laparoscopic surgery under a diagnosis of a gastrointestinal tumor or neurogenic tumor. The tumor was safely dissected and freed from the surrounding tissues using sharp and blunt maneuvers. The tumor originated from the right sciatic nerve. Complete laparoscopic extirpation was performed with preservation of the right sciatic nerve. Pathological examination suggested schwannoma. The patient recovered well but had remaining sciatic nerve palsy in her right foot. Laparoscopic extirpation for a schwannoma in the lateral pelvic space was safe and feasible due to the magnified surgical field afforded by laparoscopy.

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A Case of Pelvic Schwannoma Presenting Prominent Eggshell-Like Calcification

Cited by 4 publications

References 7 publications

Calcification and ossification in conventional schwannoma: A clinicopathologic study of 32 cases

Calcification and ossification in conventional schwannoma: A clinicopathologic study of 32 cases

Pelvic schwannoma in an adult male

Laparoscopic Extirpation of a Schwannoma in the Lateral Pelvic Space

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