Paraneoplastic syndrome due to angiomatoid fibrous histiocytoma: a known presentation of an uncommon diagnosis in a rare site and age

  1. Omer Or 1,
  2. Noam Olshinka 1,
  3. Noam Shussman 2 and
  4. Judith Diment 3
  1. 1 Department of Orthopedics, Hadassah University Medical Hospital, Jerusalem, Israel
  2. 2 Department of Surgery, Hadassah University Medical Center, Jerusalem, Israel
  3. 3 Department of Pathology, Hadassah University Medical Center, Jerusalem, Israel
  1. Correspondence to Dr Omer Or; OR@HADASSAH.ORG.IL

Publication history

Accepted:21 Nov 2022
First published:07 Dec 2022
Online issue publication:07 Dec 2022

Case reports

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Abstract

A woman in her 70s presented with a small subcutaneous retrosacrococcygeal mass and a history of elevated erythrocyte sedimentation rate present for several years. It was misdiagnosed as an inflammatory process of unclear origin. She underwent further investigation with the appearance of weight loss and weakness. A sacrococcygeal mass was noted on CT scan. A core needle biopsy was inconclusive for chordoma versus myoepithelioma. Wide surgical resection of the tumour including the coccygeal bone was performed. Following surgery, all the systemic symptoms resolved with normalisation of inflammatory markers. The pathological examination showed a relatively circumscribed multinodular myxoid tumour with lymphatic tissue cuff. Pan-sarcoma fusion analysis detected an EWSR1 (Exon7)-CREB1 (Exon7) fusion gene. The lesion was diagnosed as angiomatoid fibrous histiocytoma with paraneoplastic syndrome presentation of several years’ duration.

Background

This report describes a common presentation of an uncommon diagnosis, a rare tumour in an extremely rare location and age of presentation. We present a case of a woman in her 70s with a subcutaneous retrosacrococcygeal mass diagnosed as angiomatoid fibrous histiocytoma (AFH) following surgical resection. It presented as paraneoplastic syndrome years before its diagnosis.

AFH is a rare intermediate malignant soft tissue tumour, arising predominately in superficial areas of extremities in children and young adults. It accounts for only 0.3% of all soft tissue tumours.1 Although the literature describes cases that have exhibited metastatic potential, these are relatively uncommon.

Case presentation

A woman in her 70s presented with a subcutaneous soft tissue mass superficial to the coccygeal bone. She had a medical history of 8 years of elevated inflammatory markers, elevated erythrocyte sedimentation rate (up to >100 mm/hour) and elevated C reactive protein (>125 mg/dL, normal <5 mg/dL). She was initially diagnosed as suffering from rheumatoid fever and post-streptococcal arthritis, but the elevated inflammatory markers were constant along the years rendering these diagnoses dubious. Several years later, she had vision disturbances and headaches. Temporal arteritis was suspected and ruled out. Several months before presenting to our clinic, she developed new symptoms of weakness, weight loss and night sweats. Laboratory studies were indicative of anaemia of chronic disease. The patient had fell shortly before her ingression, injuring the sacrococcygeal area. Imaging studies showed a deep mass in the coccygeal area. The histopathological interpretation of the ultrasound-guided biopsy of the mass was inconclusive for a chordoma versus myoepithelioma. Surgical resection was performed.

Investigations

The patient presented with B symptoms and elevated inflammatory markers. The main differential diagnosis included: inflammatory disease, neoplastic disease or chronic infection.

Rheumatology work-up for polymyalgia rheumatica was negative. The serum levels of rheumatoid factor and anti-nuclear antibody were in the normal range. Neoplastic work-up ruled out a haematological malignancy, aside from the previously diagnosed anaemia of chronic disease. Contrast-enhanced CT scan to rule out a solid mass or a hidden infectious process revealed a 4 cm soft tissue mass posterior to the coccygeal bone. For better evaluation of the mass, a contrast-enhanced pelvic MRI scan was completed. It showed a soft tissue mass posterior to the coccygeal bone measuring 4 cm in the longitudinal dimension, 3.6 cm in the transverse dimension and 3.3 cm in the axial dimension, hypointense in T1 sequence, hyperintense in T2 sequence and heterogenic uptake of intravenous contrast material in T1 fat suppressed sequence. Imaging features were suggestive of sarcoma (figure 1).

Figure 1

MRI of the tumour. (B) Sagittal T1 sequence, marking the tumour adjacent to the coccygeal bone. (A Axial T1 sequence fat suppressed with intravenous contrast. Heterogeneity of contrast uptake in the soft tissue lesion.

In addition, there was a small area measuring 2 cm of bone oedema in the sacrum, unrelated to the mass, with signs of minor fracture, probably caused by the recent fall.

An ultrasound-guided biopsy of the mass was performed. The pathology report described cores of tissue from within a tumour process, composed of small spindle to ovoid cells arranged in files and clusters with a prominent myxoid stromal background. Two of the cores showed fibrous tissue with chronic inflammatory infiltrate. No necrosis or mitotic figures were identified. The tumour cells were positive for EMA immunohistochemical stain and negative for S100 and Brachyury. Ki 67 was positive in less than 5% of the cells. A differential diagnosis of myoepithelioma versus chordoma was suggested, favouring the former (figure 2).

Figure 2

Core needle biopsy H&E staining.

Differential diagnosis

The differential diagnosis of sacrococcygeal lesions includes: developmental congenital cysts (55%–65%), neurogenic cyst (10%–12%), osseous lesions (5%–11%), inflammatory (5%) and miscellaneous (12%–16%).2

The imaging studies showed a posterosacrococcygeal lesion, while developmental congenital cysts and neurogenic lesions are mostly presacral.

MRI study was suggestive of soft tissue sarcoma, ruling out most other diagnoses.

The histopathological features in the biopsy were those of a low-grade tumour with prominent myxoid stroma and embedded cords and clusters of small spindle to ovoid cells with scant cytoplasm. The differential diagnosis includes myxoid liposarcoma, extraskeletal myxoid chondrosarcoma and myoepithelioma of soft tissue and, mostly at this location, extra-axial/axial chordoma. Pathological work-up ruled out most of them, suggesting a differential diagnosis of chordoma versus myoepithelioma.

Myoepithelioma is a rare soft tissue tumour with unclear biological behaviour and malignant potential. The tumour is mostly subcutaneous and in younger patients.3 The presentation in our patient was not typical for its location and age.

Chordoma is a rare slow-growing malignant bone tumour, which arises mostly from the sacral bone and mobile spine. It is usually diagnosed in older patients; however, the age range is very wide.4 Although the patient age and location of the tumour were concerning for chordoma, the imaging study did not show definitive tumour origin from the bone.

Paraneoplastic disorders can affect many organs, most of them by an autoimmune mechanism.5 Paraneoplastic syndrome in the musculoskeletal system may present as arthropathies, muscular disorders, scleroderma, vasculitis and others.6 None of those symptoms were found in our patient.

Treatment

The findings in the biopsy were suggestive of chordoma or myoepithelioma. Due to the nature of these tumours, a wide resection including the coccygeal bone was done, with meticulous dissection to preserve the anal function.

Pathological examination of the resected tumour revealed a well-defined nodular lesion with infiltrative borders, surrounded by a cuff of lymphoid tissue with lymphoid follicles (figure 3). The lesion was composed of small spindle cells arranged in cords, trabeculae and whorls, embedded in a myxoid stroma with extensive areas of cystic degeneration and admixed acute inflammatory infiltrate (figure 4). There were foci of necrosis and few giant cells. Patchy mild to moderate atypia was present. The cells were positive for ALK1 and EMA and retained INI1 expression. Other stains performed (ROS1, SOX10, P53, synaptophysin, GFAP, pan-cytokeratin, actin, Brachyury) were all negative. A specific EWSR1-CREB1 fusion was detected on molecular assay (figure 3).

Figure 3

Final pathology of tumour, H&E staining. Lymphoid tissue with lymphoid follicles.

Figure 4

Final pathology of tumour, H&E staining. s.Myxoid stroma of the tumour

On the basis of the findings, the lesion was diagnosed as AFH.

Outcome and follow-up

The patient recovered well a few days from surgery. As soon as 2 weeks after surgery, there was a marked improvement in the well-being of the patient with complete resolution of all the systemic symptoms. The elevated inflammatory markers resolved completely (figure 5). After 3 years of follow-up, the patient is asymptomatic with no evidence of disease.

Figure 5

Inflammatory markers blood test results along the years. CRP, C reactive protein; ESR, erythrocyte sedimentation rate.

Discussion

AFH was first described by Enzinger in 19791 7–10 as a low to intermediate soft tissue tumour presenting primarily in children and young adults1 9 11 with no sex predilection, although congenital and eighth and ninth decade cases have been reported1; accounting for only 0.3% of all soft tissue tumours, potentially seen as a secondary neoplasm of other malignancies.1

Classically presents as a slow-growing subcutaneous or deep dermal tumour in extremities,1 7 9–12 but other localisations like skeletal muscle, bone, orbit, mediastinum, lung, vulva, ovary and retroperitoneum have been reported.1 7 8 11 Cases of rapid growth are thought to be secondary to intralesional haemorrhage.7

Clinically, it presents as a slow-growing tumour, with local pain or tenderness, which can be mistaken for a haematoma.1 13 B symptoms like anaemia, weight loss, chills and fever are common7 9 13 secondary membranous nephropathy that resolved after excision of the lesion has been reported.11 MRI may suggest AFH especially with accompanying systemic symptoms; however, there are no definitive imaging features.9

Microscopically, it is a well-circumscribed tumour composed of histiocyte-like cells with round to oval nuclei arranged in swirls/solid pattern with pseudovascular spaces, haemorrhage and haemosiderin. In addition, it is surrounded by a fibrous pseudocapsule with a peripheral lymphocytic cuff that can have germinal centre formation, simulating a lymph node metastasis.1 7 9 13 Chronic inflammatory infiltrate with plasma cells can be seen.3 Half of the neoplasms express desmin.1 Myxoid AFH with EWSR1-CREB1 fusion was described mainly in the central nervous system.

Morphological variants with non-classic features—diffuse myxoid change, small cells in cords, trabeculae or small clusters, giant cells and some degree of atypia—were described in a few reports, occurring mainly in atypical sites and ages, as in our case.

Three types of gene translocations were reported in AFH including t(2:22) (q33:q12) EWSR1-CREB1, t(12:16) (q13:p11) FUS-ATF1, and t(12:22) (q13:q12) EWSR1-ATF1.1 8 11 12

The paraneoplastic inflammatory syndrome induced by the tumour is thought to be mediated by tumorous interleukin (IL)-6 release. The EWSR1-CREB1 translocation involves CREB1, a transcription factor which binds to the IL-6 promoter region.14 We found this specific translocation in our case.

Treatment of low to intermediate-grade soft tissue sarcomas consists of wide resection. Total resection with clear margins reduces the risk of local recurrence and assures maintaining the low risk of metastasis. There is no known effective treatment for cases of progression or recurrent tumour. Few reports describe resolution of the symptoms and tumour growth restriction with treatment with anti-IL-6 monoclonal antibody tocilizumab,15 but in others’ experiences, the treatment suppressed the systemic symptoms but did not control the tumour growth.16

In terms of prognosis, the main problem is local recurrence. It has been reported in up to 64% of patients, usually within the first 12 months after initial excision.13 Other publications suggest improved recurrence rates of 2%–12%,1 8 10 which remain relatively high. The main favourable prognostic factor is wide resection of the tumour which leads to resolution of the clinical symptoms and laboratory findings.1

Due to the rarity of the tumour, clear guidelines were not published; however, the high local recurrence rate in the available literature supports a wide resection of the tumour as the primary treatment.

The patient’s general symptoms and elevated inflammatory markers resolved rapidly following the tumour resection. Anaemia and B symptoms like weight loss, chills and fever are common in AFH,7 9 13 and their resolution after excision suggests the slow-growing tumour was the cause of the undiagnosed prolonged clinical picture of the patient.

Patient’s perspective

THE APPLE AND DR OHR

When I was sick and lay a-bed,

I had two pillows at my head,

And all my toys beside me lay

To keep me happy all the day.

I was the giant great and still

That sits upon the pillow-hill,

And sees before him, dale and plain,

The pleasant land of Counterpane.

Robert Louis Stevenson

When I was sick and lay a-bed, most of the time I didn’t feel like reading. It was inexplicable: a distinct aversion to the written word, especially if it seemed intent upon inspiring. I had no inclination or energy to look inward, or upward. Answers didn’t interest me, nor questions. I didn’t feel like thinking.

I didn’t want visitors, either, but at least that could be attributed to something physical: my physical weakness, at the time still undiagnosed.

For I was so tired. I slept by day as well as by night, and when not sleeping, I lay in bed. Yet I wasn’t bored, that was the strange thing. I would just lie there, looking out the window. That whole summer, the tree out my window stretched out to me generously with open arms, a friend with great, long limbs adorned with green leaves and birds, keeping me company all the livelong days.

My ESR numbers had been climbing steadily for several years, and I knew what those initials stood for. For when I was growing up, my father, the writer Norman Cousins, had come down with a crippling, painful, never-conclusively diagnosed illness characterized by an elevated sedimentation rate. I’d wonder, mildly curious, if his inflammatory response was some sort of genetic antecedent to mine.

At one point during my husband’s search for answers, he brought me to see a highly acclaimed physician renowned for his prowess as a diagnostician. The waiting list was such that the only available appointment was after 11:30 at night, in his home. The doctor examined my medical history, spent a half-hour or so asking many questions, and then, with knitted brows, he quietly declared: “You know, we doctors like to think that we understand what these numbers mean. But we don’t. It could mean so many different things.” He offered to give me a prescription for painkillers, and another prescription for steroids, to bring down my inflammation. But my parents had never been in favor of medication whose purpose is to suppress symptoms rather than cure them, and I followed their example.

The doctor didn’t argue. He apologized for his inability to provide a diagnosis, made note of the fact that apart from inflammation, I appeared to be in good health, and said it was possible that whatever it was that ailed me might simply subside on its own, without medical intervention.

*

My conscience was burdened by the time and attention my family was devoting to this whole business. My children—busy adults now with young families of their own—were doing anything, everything, that they could to help. Taking turns accompanying my husband and me to this doctor and that one, that one and this one. They went together each week to the Kotel to doven for my recovery, month after month, and I was so grateful. But my gratitude was heavy to bear, because in my heart of hearts, I suspected that nothing was really wrong…nothing, at least, that a good dose of my father’s brand of willpower couldn’t cure.

My tiredness, I thought guiltily, was from depression, and my depression… just laziness in disguise.

Furthermore, although ongoing weight loss was listed as one of my “symptoms,” to my mind it was cause for celebration. As the numbers measuring inflammation kept going up, the numbers on my bathroom scale kept going down…pounds melting away without effort. I weighed now what I’d always dreamed of weighing, starting way back in high school, when I first began to envy that ethereal foreign species of females who have waistlines and no appetites. Nowadays, the mere thought of food repulsed me. So far was I from normal instinctual functioning that I recall sometimes wondering, during that period, what is it that makes people want to eat? It seemed like such an effort to chew and to swallow. Chew and swallow. Chew And swallow.

On the other hand, I took a certain odd, vain satisfaction in the fact that my ESR numbers had skyrocketed even higher than my father’s. The only thing that the hospital in 1964 had been able to offer him was aspirin, as many as 30 a day. After overhearing his doctor confide to someone on staff that he was “afraid they were going to lose Norman,” he and my mother decided to move him into a nearby hotel, rent a hospital bed, arrange for massive doses of Vitamin C to be administered intravenously, and have a home movie screen) set up so that he could watch funny movies. In Anatomy of An Illness (his 1979 book about the physiological impact of laughter, and the full range of positive emotions- hope, faith, love—upon recovery from illness) he would write that 20 minutes of belly laughter had been regularly followed by two hours of pain-free sleep. “A hospital,” he wrote only half-jokingly “is no place for someone who’s sick.”

I myself, though, in my own illness now, many decades later, wasn’t laughing, or hoping, or fighting to keep my spirits up, fighting to survive. If there really was something wrong…so be it.

My bathroom scale, on the other hand, kept giving better and better news, until one morning, at an unguarded moment, I caught sight of myself in the full-length mirror and was taken aback.

This thinness wasn’t beautiful. I was shocked.

I could see my skeleton.

*

I was scheduled for another CAT scan, and blood tests. The wild numbers opened doors. Nurses were kind. If I forgot this or that official document, or came late for an appointment, they’d wave me on in anyway.

I slept. Things were strange. Morning would be afternoon, then I’d wake up and the window by my bed would be shining, and dark. Sometimes the phone would ring, but I was tired. Once upon a time, I’d been a wife, and a mother. I’d been a friend, a sister, an aunt, a grandmother. Once upon a time I’d attended Torah classes, and had loved learning. I’d been interested in things. I couldn’t remember now what that was like. Sometimes I’d take one of my longtime favorites from the bookshelf, but the poetry and fiction that I’d always loved didn’t ring true to me anymore. What did ring true? Holocaust memoirs and histories. Those books were the toys of Stevenson’s poem, but they didn’t keep me happy. Just profoundly preoccupied by the horrendous unreality of the war, and its echoes in the news today.

I’d be startled awake by the dropping of a book from my hands, and would realize I’d dozed off.

One day, with a sort of bemused detachment, I observed something intriguing about my state of mind: if this were a novel, I thought, I’d be the character about whom we’d say: she had lost her will to live.

Oh, I thought, so that’s the story.

I’d arrived at that famous bottom of the barrel, where nothing matters.

There was a certain melodramatic pleasure in defining things this way.

One foot was in the next world.

*

The CAT scan came back and all of a sudden I was put on the fast track to surgery. They’d found a malignant growth. How interesting. I wasn’t faking? It was hard to believe.

The surgeon’s name was Dr. Ohr. Ahhh. In Hebrew, Ohr means light. A nice literary touch.

Next step after the CAT scan was a PET scan, a procedure which required drinking two tall cups of iodine, to determine by way of High Contrast the unidentified growth’s precise location, and position, and if it had spread.

Sitting in the room where a number of subdued strangers were also drinking down the radioactive concoction, each individual in his or her separate enclosure, I read in the PET Information Sheet, among other things, that for 72 hours (three days) after undergoing the scan, the patient was not to be in the presence of children or pregnant women.

I was about to become a radioactive object.

Apparently, it took something of this nature, (talk about high contrast!) to rouse me from my drowsy indifference, for the strange terror of being radioactive--no joke—triggered one the finest moments of my life.

My eyes were lifted up towards the ceiling light, and for a few long shining minutes (my guess is two or three of them) ridiculous vanities and foolishness and insincerities were eliminated from my mind.

*

On the way to the hospital for surgery, I was sitting low in the back seat of a cab (no particular reason to sit up straight) and was gazing up through the taxi window at clouds and sky. No ground. Just clouds…and air….

Clouds….

No ground.

A while later someone said, “Count to ten,” and they were waking me up.

“Everything’s fine,” said Dr. Ohr.

He smiled.

*

Two nights later, at 3 a.m., I felt an unfamiliar, disturbing sensation. There was something I wanted.

My husband, deeply asleep on the chair by my bed, woke in an instant to conduct our search through Hadassah Hospital, and who should we find but one of the Eida Chareidit people who circulate through Israel’s hospital wards throughout the wee hours of the morning, looking for hungry patients such as I. She had a cart full of kosher food, and though I wanted all of it, at that early juncture post-surgery all I could handle was one of her sour apples.

The apple looks good, I thought with wonder. I want it.

Never in my life, not even once, had it ever before occurred to me that appetite isn’t natural. It’s not a naturally-occurring, inevitable phenomenon- a sort of troublesome given, to be taken for granted as one submits to it or resists. It’s a marvelously clever physiological mechanism, purposefully invented to feed living creatures and keep them alive.

*

A few days after the operation, my ESR had plunged all the way down to number 2, at the bottom of the scale.

One sleepless night, back at home not long thereafter, having been kept awake by torment and confusion, unable to see the justification for my return to life--I was lost once again. A more serious case of it, though, this time around, for it hadn’t arisen now from illness but from mundane, regular dailiness. After all the commotion, the fall and the rise and the fall and the rise, why this Rescue Triumphant? A famous line came to mind from one of Shakespeare’s tragedies: the sound and the fury, signifying nothing. For what purpose had my life been given back to me?

The next morning I got a phone call from a friend who has no family in Israel. The friend hinted tentatively that she needed someone to do her a certain favor. Nothing spectacular—just to accompany her to a dentist appointment--because sometimes in the past she reacted to anesthesia and didn’t want to be alone. She’d asked a neighbor, and had called a few other friends, but no one was available. By any chance, she asked, you come? Do you have time?

“Yeah, sure,” I said. “I have time.”

A few hours later, standing with my friend at the bus stop after her root canal, I noticed that beneath my feet was solid ground. My heart expanded and…broke, with joy.

Appetite for Torah learning and chicken soup (with a matzoh ball) reappeared that Shabbos, followed by Apple Crumble (with brown sugar and cinnamon).

Sarah Shapiro

Jerusalem

Learning points

  • Paraneoplastic syndrome should be considered in the differential diagnosis and work-up of an unclear systemic inflammatory process.

  • Wide excision of the tumour is recommended and resolves all symptoms.

  • Paraneoplastic syndrome may be more common with EWSR1-CREB1 translocation.

  • A rare tumour in a rare location with relative common symptoms.

Ethics statements

Patient consent for publication

Footnotes

  • Contributors JD and OO—planning, conduct, reporting, patient care, conception and design, manuscript drafting and revision. NS and NO—planning, patient care and manuscript drafting.

  • Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.

  • Case reports provide a valuable learning resource for the scientific community and can indicate areas of interest for future research. They should not be used in isolation to guide treatment choices or public health policy.

  • Competing interests None declared.

  • Provenance and peer review Not commissioned; externally peer reviewed.

References

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