"Ruptured" malignant phyllodes tumor of the breast: a case report.

Phyllodes tumor or cystosarcoma phyllodes is a rare disease and is usually seen in middle-aged patients. Ruptured phyllodes tumor is a very rare condition. Our study reports patient presentation, diagnosis method, and treatment of an unusual case. A 58-year-old premenopausal female was diagnosed with a phyllodes tumor and presented with a rapidly growing mass for 2 months that ruptured 1 month later. She underwent simple mastectomy at the left side of her breast and received adjuvant radiotherapy. No recurrence was found 4 months after operation.

Introduction

Phyllodes tumor or cystosarcoma phyllodes represents roughly 0.3%–0.9% of all breast tumors1 and is usually seen in patients between 40–50 years of age.2 World Health Organization has divided this tumor into three subtypes – benign, borderline, and malignant. Stromal elements of these tumors often form leaf-like projections lined by epithelium. Surgery remains the mainstay of the treatment in patients with phyllodes tumor and complete surgical resection offers high rates of local control.3

Ruptured phyllodes tumor is a very rare condition. Our study reports patient presentation, diagnosis method, and treatment of an unusual case admitted in the Division of Head, Neck and Breast, Chiang Mai University Hospital.

Case presentation

A 58-year-old premenopausal female with underlying diseases of Chiari I malformation with syringomyelia C1-T10 levels presented to the outpatient surgical unit in a Thai provincial hospital. She had a 2-month history of a mass in her left breast and eruption of the mass with pus through the skin for 1 month. The patient reported acceleration in the growth of the mass in the past month and also complained of occasional bleeding from the mass.

Physical examination revealed a huge mass that was ulcerated, having an irregular surface, occupying the entire left breast (Figure 1). The mass bled with surface contact. There was no axillary lymphadenopathy. The right breast was normal.

Figure 1

Tumor of entire left breast (rupture size 22×18 cm).

CT scan of the chest was performed which showed a large inhomogeneous enhancing mass at the left breast, measuring 13.4×14.8×14.3 cm in size with a round-shaped nodule in the posterior basal segment of the left lower lung, measuring 0.6 cm in size (Figure 2). The intra-abdominal organs were unremarkable.

Figure 2

CT chest shows huge inhomogeneous enhanced mass at left breast.

Abbreviation: CT, computed tomography.

Core needle biopsy indicated a fibroepithelial neoplasm and differential diagnosis included fibroadenoma or phyllodes tumor. The patient underwent a simple mastectomy under general anesthesia. The resected specimen was 22×18 cm in size and the tumor did not invade the surrounding tissues. The specimen was sent for histopathology macroscopic examination as lobulated with focal necrosis and hemorrhage involving the entire specimen. The histopathology of the surgical specimen (Figure 3) revealed a malignant phyllodes tumor; 13 mitoses/10 high power field, surgical margins were approached by the tumor at the lateral and deep margins.

Figure 3

Microscopic study of phyllodes tumor.

Notes: Microscopic study of phyllodes tumor displays increased stromal cells with cleft- and leaf-like appearance of ducts and malignant spindle cells in the stroma with frequent mitoses (arrows) (H&E ×40).

Abbreviation: H&E, hematoxylin and eosin.

The patient was discharged on the tenth postoperative day in a good condition with no wound complications; no recurrence was found 4 months after operation. The study protocols were approved by the Chiang Mai University Institutional Ethical Committee, Thailand and informed written patient consent was also obtained.

Discussion

Phyllodes tumors are rare especially those that rupture. From the literature review, few studies were found in the database with each study reporting only one case.4–6 These tumors usually are presented as a well-circumscribed, firm, and mobile mass or nodule characterized by rapid growth over a short time period and classified as benign, intermediate, or malignant tumor.7 Mammography and ultrasound images were difficult to distinguish between fibroadenoma and phyllodes tumors.8 The histopathology of phyllodes tumors is characterized by epithelial-lined cleft-like spaces with a hypercellular stroma, organized into leaf-like fronds. Standard treatment for phyllodes tumor is surgery and the treatment of choice is wide local excision9 with adequate margin of healthy tissue (greater than 1.0 cm), but mastectomy is recommended for high tumor-to-breast ratios or when an inability to obtain adequate margins occurs. Adjuvant chemotherapy including doxorubicin and dacarbazine is rarely used for this type of breast tumor; few studies have reported that this treatment did not affect patients’ survival.10,11 Adjuvant radiotherapy is also controversial. Some studies have shown no improvement in the prognosis, whereas other studies have shown better local control12 but did not affect disease free survival or overall survival.13 Chaney et al suggested that radiotherapy is recommended for borderline or malignant phyllodes tumors because the risk of local recurrence is high especially with positive margins, margin less than 0.5 cm, tumor size greater than 10 cm, or recurrent disease.10 Most phyllodes tumor express ER and PR and endocrine therapy has no proven role in the adjuvant treatment, and ER and PR decrease expression in high-grade subgroup of phyllodes tumor.14

We have reviewed the ruptured phyllodes tumor of the breast and its summary is given in Table 1.

Table 1

Literature data of patients with ruptured phyllodes tumor4,6,15,16

Patient no	Age (years)	Operation	Country	Follow-up after operation
1	32	Wide local excision	Bangladesh	9 months; no recurrence
2	40	Simple mastectomy	India	3 years; no recurrence
3	38	Simple mastectomy	Pakistan	1 year; no recurrence
4	48	Simple mastectomy	Sri Lanka	4 years; no recurrence

Conclusion

Phyllodes tumors are uncommon fibroepithelial breast tumors in which ruptures are extremely rare. There is a high index of suspicion for this tumor if a patient has a history of rapid-growth of breast mass. Phyllodes tumors often appear on ultrasound and mammo graphy and are difficult to distinguish from fibroadenoma. A simple mastectomy is performed only if negative margins cannot be obtained by wide local excision. Inadequate surgical management may lead to local recurrence. Adjuvant radiotherapy is considered in individual patients.