A rare case of Erdheim-Chester disease in the breast
From the aDepartment of Radiology, King Abdullah Medical City, Makkah, Saudi Arabia; bDepartment of Oncology, King Abdullah Medical City, Makkah, Saudi Arabia
Binyousef RF, Al-gahmi AM, Khan ZR, Rawah E. A rare case of Erdheim-Chester disease in the breast. Ann Saudi Med 2017; 37(1): 78-83.
Erdheim-Chester disease (ECD) is rare non-Langerhans histiocytosis with distinctive radiologic and pathologic entities. We report a rare case of which ECD was involving the breast with only eight similar cases reported in the English literature. Our patient was a 52-year-old female patient with ECD involving the breast, mesentery, left kidney, retroperitoneum and the skeleton. The diagnosis was based on distinctive imaging and histopathological findings. The patient received a new novel treatment as part of a clinical trial in the United States and showed clinical and radiological improvement.
Erdheim-Chester disease (ECD), also known as polyostotic sclerosing histiocytosis, is a rare non-Langerhans histiocytosis with distinctive radiologic and pathologic entities. It is characterized by foamy histiocyte infiltration and was first described in 1930. There are fewer than 500 cases reported. ECD usually involves the skeleton, skin and retroperitoneum.1,2 Our case was unique in that it was a rare case that also involved the breast. Only eight similar cases have been reported in the English literature (Table 1, available online https://goo.gl/avbVwU).
A 52-year-old female patient complaining of multiple bilateral breast and axillary swellings with no history of trauma or nipple discharge was referred to our hospital for further workup. The patient had a past medical history of diabetes insipidus and was taking desmopressin. On initial examination, the patient was febrile, complaining of fatigue and bilateral periorbital xanthelasma. Breast examination showed multiple bilateral large hard breast and axillary masses. Laboratory tests showed decreased albumin levels, a high white blood cell count and a low red blood cell count. Diagnostic mammography for both breasts was compared to previous mammography from 2 years ago. The current study showed no obvious masses (Figure 1A). Complimentary breast and axillary ultrasound showed multiple large hypoechoic breast masses (Figure 1B). A CT scan showed bilateral large heterogeneous breast masses extending to the axilla (Figure 1C). A diffuse infiltrative process involving the subcutaneous tissues was seen in the midline and perianal region (Figure 2A, 2E). Infiltrations of small areas were seen in the retroperitoneum, mesentery and the left kidney (Figure 2B, 2C, 2D). A whole body bone scan showed bilateral symmetrical increased tracer uptake in the distal part of the femur and tibia (Figure 3A), which correlated to sclerotic bone changes in the corresponding SPECT-CT images (Figure 3B).
Multiple core biopsies were taken from the breast and axilla. Histopathology showed sheets of xantho.matous histiocytes with abundant foamy cytoplasm and occasional multinucleation. The histiocytes were mixed with few small lymphocytes (Figure 4A). In the immunohistochemistry tests, the histiocytes were positive for CD68 and negative for CD1a and S-100 (Figure 4B). The samples were sent for genetic testing, which showed a BRAF codon 600 mutation.
After clinical, radiological and histopathological evaluation, the patient was diagnosed with ECD. The patient sought medical advice in the United States at Memorial Sloan Kettering Oncology Center and participated in a clinical trial. At the time of writing the patient was being treated with vemurafenib, which is B-Raf inhibitor. The patient was showing good tolerance and an excellent clinical and radiological response (Figure 5A, 5B).
ECD is an extremely rare disease of unknown etiology. ECD affects both genders with a male predominance and mean age of 53 years.1,2 The most commonly affected site is the skeleton, mainly the long bones. These lesions usually appear as bilateral symmetrical heterogeneous sclerosis of the affected bones from bone marrow replacement with infiltrative foamy his.tiocytes. These lesions show significant radiotracer uptake in bone-targeting nuclear studies.1,2 Most cases of ECD show at least one extra-skeletal involvement at the time of diagnosis. Most commonly affected extra-skeletal sites in descending order are the retroperitoneum, heart, lung, central nervous system, skin, then pituitary gland and orbits.1,2
The patient’s clinical manifestations vary and depend on the site of involvement. The most common symptom is juxta-articular pain, particularly of the lower extremity.1,2 Abdominal and back pain were also reported due to involvement of the retroperitoneum.1,2 However, the most debilitating symptoms are caused by cardiac and pulmonary involvement and are a significant cause for mortality and morbidity.1,2 CNS involvement is less common and it is predominantly periorbital and presents with exophthalmos and visual changes.
The rarity and variable presentation of this disease usually leads to delayed diagnosis, which combined woth a lack of definite treatment leads to high mortality rates from associated complications. In conclusion, ECD in the breast is a very rare and its imaging findings very considerably. Other systemic imaging findings combined with the histopathological findings facilitate the final diagnosis. B-Raf inhibitors like vemurafenib are promising new treatments for ECD patients with BRAF mutation.
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