Mycetoma

What it is

From: Orphanet

A neglected tropical infection, rare in Europe, characterized by subcutaneous tumorous lesions in which mycetoma grains containing the causative agent can be observed. Mycetoma is a broad term encompassing both actinomycetoma (bacterial) and eumycetoma (fungal).

Reported clinical features and what the terms mean

The following findings are associated with this condition in Orphanet. They are not a checklist for diagnosing yourself, and they do not all occur in every affected person. Some are examination, imaging or laboratory findings that cannot be recognised at home.

The frequency labels describe how often a finding was reported among people with the condition in the source. They do not give the chance that a person with that symptom has the condition. Definitions below reproduce HPO terminology; they explain the term, not the likely severity in an individual.

Abnormal bone structure · Frequent (79-30%)

Any anomaly in the composite material or the layered arrangement of the bony skeleton.

Cobblestone-like hyperkeratosis · Frequent (79-30%)

The presence of verrucous, cobblestone-like papules and nodules in a region of skin that is said to have an appearance like that of cobblestones.

Prominent superficial veins · Frequent (79-30%)

A condition in which superficial veins (i.e., veins just under the skin) are more conspicuous or noticeable than normal.

Recurrent bacterial skin infections · Frequent (79-30%)

Increased susceptibility to bacterial infections of the skin, as manifested by recurrent episodes of infectious dermatitis.

Recurrent fungal infections · Frequent (79-30%)

Increased susceptibility to fungal infections as manifested by multiple episodes of fungal infection.

Stiff skin · Frequent (79-30%)

An induration (hardening) of the skin

Structural foot deformity · Frequent (79-30%)

A foot deformity resulting due to an abnormality affecting the bones of the foot (as well as muscle and soft tissue). In contrast if only the muscle and soft tissue are affected the term positional foot deformity applies.

Subcutaneous nodule · Frequent (79-30%)

Slightly elevated lesions on or in the skin with a diameter of over 5 mm.

Abnormal appendicular skeleton morphology · Occasional (29-5%)

An abnormality of the appendicular skeletal system, consisting of the of the limbs, shoulder and pelvic girdles.

Abnormality of the hand · Occasional (29-5%)

An abnormality affecting one or both hands.

Abnormality of the knee · Occasional (29-5%)

An abnormality of the knee joint or surrounding structures.

Abnormality of the lymphatic system · Occasional (29-5%)

An anomaly of the lymphatic system, a network of lymphatic vessels that carry a clear fluid called lymph unidirectionally towards either the right lymphatic duct or the thoracic duct, which in turn drain into the right and left subclavian veins respectively.

Cutaneous cyst · Occasional (29-5%)

A hollow mass located in the skin that is surrounded by an epithelium-lined wall and is well demarcated from the adjacent tissue. Cysts are often said to be sac-like and may contain serous liquid or semisolid material.

Osteomyelitis · Occasional (29-5%)

Osteomyelitis is an inflammatory process accompanied by bone destruction and caused by an infecting microorganism.

Other findings in the same source

From: Orphanet

Additional reported features include Osteoporosis (Occasional (29-5%)); Abnormal forearm bone morphology (Occasional (29-5%)); Abdominal mass (Very rare (<4-1%)); Abnormal form of the vertebral bodies (Very rare (<4-1%)); Abnormal thorax morphology (Very rare (<4-1%)); Abnormality of head or neck (Very rare (<4-1%)); Abnormality of the nervous system (Very rare (<4-1%)); Back pain (Very rare (<4-1%)); Bone cyst (Very rare (<4-1%)); Painless fractures due to injury (Very rare (<4-1%)). This is a selected summary, not a complete description of the condition.

When it may begin

From: Orphanet

All ages

Inheritance in the source

From: Orphanet

Not applicable

Frequency and the population described

From: Orphanet

Point prevalence: 1-9 / 100 000; Sudan; Value and class. Point prevalence: 1-9 / 100 000; Mauritania; Value and class.

Which doctor should you see?

The suggested department for discussing Mycetoma is Infectious Diseases, with a general physician / infectious disease specialist as the relevant type of clinician. General physician / Family Medicine; paediatrician for children. Referral depends on symptoms.

This is an editorial referral starting point. The appropriate clinic depends on the person’s age, symptoms, previous diagnosis and local services. The first clinician can decide whether another specialty or a team is needed; a department label does not confirm the diagnosis.

How to prepare for an assessment

Bring a short timeline of the main symptoms: when they first appeared, whether they are constant or episodic, what seems to change them, and how they affect daily activities. Include previous reports, discharge summaries, current medicines and supplements, allergies, and any relevant family history. A dated record is more useful than trying to match every feature in an online article.

Ask the clinician what is already established and what remains uncertain. If a test is suggested, ask what question it answers, what its limitations are and how the result would change the next step. The information here is not an instruction to arrange every possible test. In children, bring growth, developmental and school information if it is relevant to the concern.

• Which exposure or organism is suspected, and what evidence would confirm it?
• Are precautions, vaccination or advice for close contacts relevant to this infection?
• What should happen if symptoms worsen or do not improve as expected?

Treatment discussions and follow-up

The material gathered for this draft does not provide a complete condition-specific treatment pathway for Mycetoma. That gap does not mean that treatment is unavailable. A clinician needs to establish the diagnosis and review current guidance before recommending medicines, procedures, rehabilitation or other support.

Before leaving the appointment, clarify the next review date, who will communicate results, and whom to contact if the situation changes. Discuss difficulties with sleep, work, school, mobility, eating or emotional wellbeing when these are relevant. Practical support may require coordination between the treating clinician and other services.

The collected references do not establish a complete prevention or long-term outlook section for this entry. Missing information should not be interpreted as proof that prevention is impossible or that a particular outcome is inevitable. Ask what is known for the exact subtype, stage and personal circumstances, and which uncertainties remain.

When to seek emergency help

Severe breathing difficulty, collapse, new stroke-like symptoms, a seizure that is prolonged or repeated without recovery, uncontrolled major bleeding, or an immediate risk of self-harm require emergency help. In India, call 112 or reach the nearest emergency department. This is a general, non-exhaustive warning list; it is not a condition-specific triage tool.