Clinical & Experimental Dermatology and Therapies (ISSN: 2575-8268)

Article / original article

"Primary Mucinous Carcinoma of the Skin (Colloid Carcinoma of the Skin) Report of a Case and Brief Diagnostic Algorithm"

Francisco Javier Torres Gómez 1*, Pilar Fernández Machín1, Carolina Cantalejo Rodríguez2 and Álvaro Cabello Santos2

1Pathology Unit, High Resolution Hospital, Agencia Sanitaria Bajo Guadalquivir, Utrera, Sevilla, Spain

2Carolina Cantalejo Rodríguez, Dermatology Unit, High Resolution Hospital, Agencia Sanitaria Bajo Guadalquivir, Utrera, Sevilla, Spain

*Corresponding author: Francisco Javier Torres Gómez, Pathology Unit, High Resolution Hospital, Agencia Sanitaria Bajo Guadalquivir, Utrera, Sevilla, Spain, Tel: +34 629344869; Email:

Received Date: 11 May, 2016; Accepted Date: 31 May, 2016; Published Date: 14 June, 2016

Colloid Carcinoma is a rare malignancy in a cutaneous location. Although its histological features are characteristic, it is necessary to rule out an extracutaneous primary. We report a case of mucinous carcinoma in the skin with an emphasis on histology and differential diagnosis.

Keywords: Carcinoma; Colloid Skin; Mucinous

1. Abbreviations

CT        :               Computerized Tomography

EMA     :               Epithelial Membrane Antigen

HE        :               Hematoxilin-Eosin

PAS     :                Periodic Acid Schiff

PSA     :                Prostatic Specific Antigen

2. Introduction

Colloid Carcinoma is a primary cutaneous extremely rare malignancy whose diagnosis must rule out a primary origin in different locations where their finding is more common. We present a case that reflects all the features of this singular entity.

3. Case Report

It is a 74 years old woman patient who went to the Department of Surgery due to the presence at right armpit level, of a progressive growth pseudonodular mass, with focally ulcerated surface. Excisional biopsy was performed and surgical specimen was submitted to the Pathology Unit where it was processed according to routine protocols. The lesion showed an irregular ulcerated surface and global gelatinous appearance (Figure 1). Histological study allowed the observation of a focally ulcerated epidermis due to infiltration by an invasive epithelial lesion set in the dermis (Figure 2). Such neoplasia consisted of large lakes of mucinous material within which nests, trabeculae and tubular formations, (some with a cribriform pattern) of epithelioid basaloid habit with little or no atypia and low mitotic activity (Figures 3-5) were visible. Mucinous material stained with PAS while neoplastic epithelial nests were positive for cytokeratin 7 (Figure 6), cytokeratin 19 and EMA (Figure 7). Neoplastic cells were negative for cytokeratin 20. Morphological and immunohistochemical data and pattern clearly invasive allowed the diagnosis of mucinous carcinoma (colloid carcinoma).

In a second time we had to rule out an extracutaneous primary origin for which mammographic and ultrasonographic studies were performed. Once a primary breast location were descarted a pancolonoscopy without findings was also carried out; additional immunohistochemistry (neoplasm negativity for cytokeratin 20) discarted this origin. Endoscopy of the upper digestive tract, the study of salivary glands, PSA levels, digital rectal examination and systemic image studies with CT were carried out with negative results.

4. Results

It seems logical to consider the tumour as a primary Mucinous Carcinoma of the skin.

5. Discussion

The first description of primary cutaneous Mucinous Carcinoma is attributed to Lennox et al., in 1952 [1]. This is an extremely rare cutaneous neoplasm, more frequent in advance ages with preferential localization in head and trunk that has a course usually indolent although it has capacity for recurrence and metastases [2-6]. As in our case, debuts as a nodular lesion of progressive growth depending on the extent of the mucinous component, so will be the consistency and macroscopic appearance of the lesion. The neoplasm does not show encapsulation but infiltrative pattern composed of lakes of mucin within which epithelial cell nests exhibiting different architectural patterns are distinguished. The density will vary from case to case and will result in the classification of neoplasm in pure (the mucinous component occupies more than 90% of the tumor) or mixed, as in our case (greater ductal epithelial component) [5]. Cellular pleomorphism is generally limited as is also uncommon mitotic activity. Cases have been reported where there is a component in situ (not present in ours) that can be shown with the help of immunohistochemistry for p63 or calponin, that will stain the surrounding myoepithelial cells [7,8]. The presence of a component in situ at skin level will help us when assigning a skin origin.

To make the diagnosis of primary cutaneous colloid carcinoma is mandatory rule out primary outbreaks in other locations, circumstances in which the immunohistochemistry may be helpful. Hormone receptor immunostaining does not help discriminate the primary skin or breast malignancies as both can and do show positivity for them. Surgical excision is the treatment of choice but recurrences (about 20%) do occur generally related to different histological patterns. The prognosis is related to the complete or incomplete resection (most common scenario) of the tumor. Our patient had no recurrences after two years of follow-up.

 Figure 1: Mucinous Carcinoma of the skin. Macroscopic image in which the gelatinous features of the lesion can be observed.


Figure 2: Mucinous Carcinoma of the skin histology. Large mucinous lakes inside which multiple epithelial nests can be observed, HE 100x.


Figure 3: Mucinous Carcinoma of the skin histology. Apposition of mucinous lakes and epithelial groups of cells, HE 200x


Figure 4: Mucinous Carcinoma of the skin histology. We can appreciate the relationship between epithelial nests and mucinous lakes in more detail, HE 200x.


Figure 5: Mucinous Carcinoma of the skin histology. Some groups of epithelial cells show a cribriform pattern HE 400x.


Figure 6: Mucinous Carcinoma of the skin histology. Epithelial cells are positive with CK 19 (epithelial membrane antigen), CK19 100x.


Figure 7: Mucinous Carcinoma of the skin histology. Epithelial cells are positive with EMA (epithelial membrane antigen), EMA 200x.


Citation: Gómez FJT, Machín PF, Rodríguez CC, Santos AC (2016) Primary Mucinous Carcinoma of the Skin (Colloid Carcinoma of the Skin) Report of a Case and Brief Diagnostic Algorithm. Gavin J Dermatol Res Ther 2016: 1-3.

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